人教版四年级数学下册小数加减法混合运算专项练习题45.docx
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人教版四年级数学下册小数加减法混合运算专项练习题45.docx
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人教版四年级数学下册小数加减法混合运算专项练习题45
一、口算。
3.6+0.4=7.8+0.6=0.85+0.33=8.4+0.7=
2.7+0.8=7.3+0.5=0.66-0.22=6.9-0.1=
6.7+0.5=6.9+0.7=0.83+0.37=6.8-0.7=
5.5-0.2=6+0.7=0.82+0.12=5.5+0.8=
2.1-0.3=7.1-3.7=0.77+0.26=6.8-0.8=
1.8-0.2=8.3-0.4=0.81+0.18=3+0.8=
6.8+0.9=8.9+1.5=0.89-0.24=4.9-0.2=
3.9-0.9=6.9-4.7=0.78-0.23=6-0.1=
二、混合运算。
0.77-0.41+56.2-0.15-3.8537.8+13+18.7
61.66+41.3+84.4260.54-22.27+63.849.56-7.34-1.05
70-(7.74+0.4)94+(18.8+5.5)6.59-3.05+2.32
一、口算。
3.6+0.4=8.5-3.1=0.83+0.09=8.7+0.3=
2.3-0.1=8.4+4.4=0.89+0.32=5.6+0.3=
2.8-0.7=8.2-0.3=0.68+0.04=3.6+0.6=
4-0.8=8.1-2.7=0.67-0.18=1.7-0.6=
7.8-0.2=7.9-4.8=0.66-0.13=7.7+0.5=
5.3-0.1=6.9-4.4=0.9-0.2=3.6-0.4=
6.1-0.4=6.8+2=0.85-0.1=3-0.1=
4.1+0.9=8.6+3.1=0.68+0.18=2.1+0.6=
二、混合运算。
0.87+0.22+6.56.7-0.7-4.379.5-59.3+12.3
77.77+14.91+67.1860.46-15.43+62.025.43+1.49-3.2
90-(1.63+0.55)63.7-(20.4+2.8)6.91-3.14+1.64
一、口算。
3.4-0.9=6.1-0.1=0.66-0.1=7.1+0.5=
2+0.7=7.7-0.6=0.87+0.24=3.6+0.5=
4.1+0.7=8.9-2.9=0.66+0.26=4.7-0.3=
3.3+0.3=6.6-0.5=0.81-0.33=6+0.1=
7.4+0.1=8.7+3.9=0.72+0.09=6.4-0.5=
7.1-0.6=6.9-0.8=0.63+0.09=7.5+0.7=
2+0.6=8.8-0.5=0.86-0.06=6.6-0.5=
3.6-0.1=8.1+3.1=0.69+0.31=7.2+0.7=
二、混合运算。
0.86-0.09+1.45.5-0.69-3.3143-17.1-22
88.48-48.17+99.6383.83-47.78+936.36+4.7+1.57
40-(2.95-0.35)61.3+(16.4+6.6)7.41+2.91-3.01
一、口算。
6.2+0.7=7.6+2.8=0.9+0.09=2.5+0.7=
4-0.5=7.6+0.7=0.79-0.06=2.8-0.6=
2.9-0.4=6.9+4=0.86-0.23=1.9-0.4=
7.1+0.4=6.3-3.4=0.9+0.3=8.6-0.5=
5.2-0.6=7.4-4.9=0.74-0.2=1.3-0.7=
4.4-0.4=7.7-3.5=0.75+0.29=6+0.3=
5.9+0.4=6.4-3.1=0.83+0.23=6.6+0.4=
8.1+0.4=8+2.4=0.68+0.31=8+0.6=
二、混合运算。
0.9+0.25+1.89.5-0.69-0.3139.4-23.9-12.2
86.61-10.45+65.5689.72-10.16+89.473.63-1.93+1.11
20-(7.67-0.12)72.1-(28.6-4.3)5.64-1.8+2.6
一、口算。
3.8+0.4=6-4.7=0.68-0.17=6.3-0.4=
7.1+0.5=6+0.3=0.79+0.31=7.3-0.6=
6.3-0.9=8.1-3.3=0.75-0.28=4-0.7=
2.7-0.8=7.5-3.3=0.69+0.16=8.3+0.9=
1.9-0.9=7.8+3.4=0.62+0.44=4.2-0.9=
7.7-0.6=7.1-0.3=0.64-0.19=7.6-0.6=
6.9+0.4=6.8-1.8=0.85-0.31=5.4+0.1=
3.8-0.4=7.9+1.6=0.64+0.23=1.4+0.6=
二、混合运算。
0.65-0.27+9.95.6-0.54-1.4648.6+15.7+16.9
75.77+27.21+20.6784.82+19.78+60.957.14+3.49+2.54
70-(7.55-0.42)70.4-(22.4+1.6)8.93-2.53+5.93
一、口算。
7-0.1=7+2.6=0.64+0.48=3.1+0.3=
2.6+0.2=8.8-4.2=0.69-0.02=1.3-0.3=
7.5-0.9=6.6+3.6=0.68+0.39=4.9-0.8=
4.9-0.5=7.3-0.9=0.61-0.21=6.4-0.1=
4.5+0.6=8.3+2.1=0.68+0.34=7.7-0.9=
5.5-0.8=7.2-0.6=0.78+0.12=1+0.4=
3.6-0.8=7.6-1.1=0.84-0.43=8.4-0.8=
1.7-0.9=8.5+0.3=0.82+0.09=3.8-0.4=
二、混合运算。
0.6-0.2+7.27.4-0.51-1.4993.3-65.5+24.1
70.15-37.56+14.6374.78-26.51+13.037.89-1.12+4.24
50-(8.7+0.53)83.1+(10.4-3.8)6.43+4.45-1.87
一、口算。
1.5+0.9=6.2+0.3=0.87+0.43=8.7+0.5=
4.7-0.7=7-4.7=0.71+0.34=5.4-0.7=
6.9-0.3=6.6+1.1=0.82-0.25=2.3-0.7=
3.9-0.5=8.5+1.3=0.61+0.13=3.2+0.8=
3.7-0.3=8.2-3.9=0.65+0.12=1.2-0.3=
5.9-0.3=7.4+1.3=0.9-0.14=4.9-0.8=
7.4-0.4=6.8-1=0.86-0.23=4.3+0.8=
3.3-0.9=8.1-3.7=0.64+0.45=6.6-0.3=
二、混合运算。
0.7+0.17+1.59.2-0.6-0.492.3+32.1+53.7
85.63-29.62+83.0565.2-37.62+69.066.32-2.42+1.54
50-(5.3-0.71)88.2+(18.6-7.1)7.99-6.02+1.29
一、口算。
3.5-0.6=6.1+0.3=0.81+0.46=5.4-0.9=
8.2+0.8=7.5-2.7=0.75+0.08=8.1-0.5=
3.3+0.2=8.5-3.8=0.68-0.47=1.7+0.5=
6.3-0.2=6.5-0.9=0.64-0.05=4.7+0.8=
7.8-0.8=7.3-3=0.89+0.4=5-0.2=
8.7+0.9=9-3.8=0.69+0.01=3.7+0.8=
6.9+0.2=8+1.9=0.76+0.24=6.5+0.8=
1.9-0.4=8.3+4.7=0.61-0.32=1.8+0.9=
二、混合运算。
0.86-0.2+8.19.6-0.37-3.6348.3+19.4+10.7
84.82+23.55+37.1475.11+30.22+57.323.75-2.16+1.5
40-(6.21+0.5)90.6-(14.5+5)6.35-3.86-1.96
一、口算。
6.8+0.1=8.6-4.1=0.89+0.38=8.4-0.7=
8.8-0.8=9-2.3=0.79-0.49=6.6+0.3=
2.4+0.3=7.7-4.3=0.77+0.28=2.8+0.9=
8.5-0.9=6.3-1.6=0.64+0.12=4+0.7=
6.4+0.7=7.1-3.8=0.75+0.39=6.9-0.2=
7.6-0.2=7.1-4.5=0.75+0.3=7.9+0.4=
4.5-0.8=7.8+0.8=0.66+0.09=4-0.1=
8.9+0.7=8.8+3.9=0.68-0.34=7+0.2=
二、混合运算。
0.64+0.16+6.15.7-0.48-1.5259.7+35.8+17.8
74.81+31.29+33.0465.11-22.57+21.867.4+2.36-4.82
80-(1.65-0.46)80.8+(15.7-5.8)6.71+1.71+2.4
一、口算。
2-0.6=8-4=0.81-0.13=2.8-0.5=
5.5+0.2=8.2+4.7=0.77+0.42=1.7+0.5=
8.6-0.1=7.8+1.1=0.88+0.31=8.5-0.2=
6.8-0.7=7.9+4.7=0.8-0.34=3.7+0.2=
4.7-0.2=7.5+0.7=0.88-0.42=4.2+0.8=
8.5+0.1=6.3+2=0.82+0.23=1.9+0.8=
2.6+0.3=8.4+3.1=0.61+0.36=8.4+0.8=
4.2+0.9=7.3+0.3=0.83-0.28=3.9-0.5=
二、混合运算。
0.72-0.36+2.58.9-0.55-0.4538.2-15.1+21.1
61.31+25.25+46.5482.1+43.4+81.877.42+3.48-2.43
60-(6.18-0.47)87.3-(10.1+5)4.41+1.5-1.85
一、口算。
6.6+0.6=6.8-4.8=0.64+0.37=8.5+0.3=
8.5-0.5=8.8+0.9=0.82+0.1=3-0.2=
7.1-0.3=7.4+2=0.6+0.14=4.7+0.1=
1.6+0.9=6.1+0.8=0.74+0.46=8.8+0.3=
3-0.9=8.6-3.9=0.65+0.41=7.5+0.2=
1.1-0.7=7.5-3=0.6-0.24=5.1-0.6=
7.5-0.9=7-2=0.73+0.08=4.7+0.8=
6-0.1=7.6-1.2=0.6-0.05=1.8+0.5=
二、混合运算。
0.87+0.4+6.56.5-0.67-0.3377.8+57.7-17.3
69.15+10.46+85.1868.49+19.58+28.214.11-1.61-1.93
70-(6.72+0.56)97.8+(15.2-4.3)4.77-3.05+1.2
一、口算。
4.2+0.4=6-3.4=0.81+0.07=6.2-0.7=
6.2-0.6=6.9+4.9=0.64-0.09=4+0.7=
6.3+0.8=7.1+3.8=0.62-0.18=2.1+0.9=
4.1-0.9=8.4+1.5=0.61-0.15=7-0.4=
2.9+0.6=6.7+2.6=0.69-0.43=3.1-0.8=
3.8+0.6=7.9+1.7=0.9-0.02=8.2-0.8=
6.1+0.3=6.2-1.9=0.81-0.49=4.1-0.2=
1.8-0.5=6.1+4=0.72-0.31=1.6+0.4=
二、混合运算。
0.6+0.42+6.19.9-0.29-2.7180.9+58.2-17
81.64-21.41+25.4889.02+12.94+48.479.98+8.08+1.6
60-(6.66-0.61)97.7+(29-9.9)6.58+3.19-2.26
一、口算。
8.2+0.4=7.5-3.5=0.64+0.14=6.5-0.4=
6.4-0.4=6.5-3.1=0.71-0.3=4.6+0.8=
1.3+0.4=6.1+2.9=0.64+0.16=2.3-0.3=
4.8+0.5=6.5-0.8=0.69+0.41=3.6-0.6=
1+0.7=8.8+3.3=0.71-0.28=4.9-0.6=
6.1-0.3=7.2-0.2=0.81-0.24=5.3+0.2=
2-0.3=8.4+2.6=0.72-0.39=5.2-0.1=
3.1+0.8=7.5+1.7=0.74-0.41=8.9+0.2=
二、混合运算。
0.77+0.32+3.38.5-0.9-4.184.7-32.6+27.1
86.1-38.74+82.5181.34-33.38+32.817.24-2.43+1.9
80-(8.09+0.61)69.6+(20.5-8.2)5.29+2.3-2.84
一、口算。
5+0.6=8.1+0.2=0.73-0.48=1.2-0.5=
1.1-0.8=6.4-1.7=0.6-0.42=7.3-0.4=
8.4+0.5=6.2-0.6=0.62-0.21=2.2-0.7=
2.4+0.2=6.3-2.2=0.75-0.4=7.9+0.1=
3.7+0.3=8.5+3.3=0.69+0.32=1.3+0.2=
5+0.4=7.6+0.2=0.85+0.3=5.8+0.4=
5.4-0.9=6.5-3.2=0.89+0.3=6.4+0.9=
6.4-0.5=6.2+1.4=0.72-0.11=6.7-0.8=
二、混合运算。
0.89+0.29+17.7-0.74-0.2656.9+26.1+15.8
75+10.31+40.2479.23+46.57+48.836.92+4.53-2.29
30-(9.17+0.38)97.4-(15.1+1.4)4.19-2.21-1.03
一、口算。
6.6+0.7=8-3.2=0.6+0.43=3.5-0.9=
8.3+0.9=8.1-4.5=0.83+0.12=3.7+0.6=
6.6+0.7=6.4+1.2=0.67-0.12=5+0.3=
7.7+0.8=8.7+3.3=0.67+0.13=1.7+0.8=
6.1+0.5=8.2-4.2=0.7-0.43=8.4-0.5=
3.4-0.6=6.9-4.5=0.82+0.35=8+0.8=
8.3-0.4=6.3-3.9=0.65+0.36=1+0.1=
4.6+0.3=8.1-3.7=0.67-0.48=8+0.2=
二、混合运算。
0.81+0.34+85.3-0.85-3.1575.2+17.1+33.7
66.83+48.27+36.3677.38-24.66+84.125.86-4.12+1.52
50-(7.98+0.72)77.7+(29.2+4.9)9.59-4.25+4.33
一、口算。
5.6-0.1=7.1-4.6=0.63-0.41=7+0.2=
4.3-0.8=6.4-0.7=0.79+0.43=4.7-0.6=
1.6-0.9=6.1-1.7=0.89-0.32=5.2+0.3=
7.9+0.6=6.2-3=0.81-0.36=7.6-0.4=
5.7-0.8=8.1+0.8=0.72+0.28=6.7-0.7=
8.7+0.4=6.8+4.9=0.66-0.04=5.5+0.4=
9-0.8=6-4.8=0.87-0.04=6-0.6=
5.1+0.4=7.5+2.8=0.61-0.2=6.9-0.3=
二、混合运算。
0.72-0.36+1.79.5-0.22-3.7884.3+65.9-11.5
61.68+11.26+10.2385.76-40.84+72.073.72+2.2-1.08
70-(8.85+0.79)93.8+(10.6+9.3)5.06-3.27-1.3
一、口算。
7.2-0.9=7.4-3.1=0.74-0.3=6-0.6=
8.1-0.8=7.4+0.2=0.75-0.35=2+0.1=
2.3-0.7=6.9+2.5=0.77-0.07=4.8-0.5=
3.6+0.7=7.9-4.8=0.69+0.3=1.4+0.7=
3.8-0.9=8.5-4.5=0.83-0.47=4.1+0.9=
1.2+0.2=6.1+3.1=0.9-0.25=6.7+0.2=
4.9-0.8=6.7-3.9=0.82+0.02=5.7-0.8=
5.8+0.4=6.2-1.7=0.77+0.19=1.5+0.2=
二、混合运算。
0.77-0.08+8.56.6-0.51-0.4997.3-51.9+11.3
61.85-30.79+19.4470.09+12.27+14.863.76-1.58-1.62
60-(8.27-0.79)60.5+(22.7-7.6)9.83+3.68+2.25
一、口算。
9-0.8=6.4+0.6=0.66+0.33=5+0.3=
5.1-0.8=8.4+3.2=0.8+0.46=2.8-0.8=
8.9-0.4=8.4+0.6=0.86+0.05=2.9
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