小数混合计算500道含简算答案版docx.docx
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小数混合计算500道含简算答案版docx.docx
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小数混合计算500道含简算答案版docx
小数混合运算+简算
计算题(共19小题)
1.用简便方法计算.
2•计算下而各题,怎么简便怎么算.
35-0.8X31.84.6X5.9+5.9X5.424.4X2.5^24.4X0.5
6.
934-3-1^0.3
计算(能简算要简算)
(2400-480X2.5)一1.6
2.64+8.67+7.36+11.332.74X9.5+0.5X2.7
7.脱式计算,能简算的要简算.
42X10.1(20+8.5)*15
&计算下面各题,能简算的要简算.
90X4.5+453.8X1.96-3.8X0.46-3.8X0.5(0.125+1.25+12.5+125)X8
9.脱式计算,能简算的要简算.
13・用自己喜欢的方法计算.
720-800—16
[12-(34-35)]H-7108.5一[(1+0.5)X5]
14•下面各题,怎样算简便就怎样算.
2.45-(1.45+0.89)1.25X1.7X0.8
5.3X0.82-0.82X0.3
3.6一[12X(0.53-0.45)]・
12.8+2.04X9.50.15X1999+0.150.76X6.5-0.76X5.578*0.25宁0.4.
17・下而各题怎样算简便就怎样算.
6.8X0.46+0.545.4X23+5.4X7.70.25X32X12.575子1.25一&
18.脱式计算,能简算的要简算.
0.34X1018.8X1.25
21.9-9.28・10.72
2.94X6.3+3.7X2.942.7+C11.2-2.7)X0.4
1.5X[0.024-(2.1-2.09)].
19・递等式计算,能简便计算的要简便计算.
4.6X253.754-12.54-0.82.5+7.54-4
(3.2-1.4)4-0.18-1.8
7.9X7.1+2.9X7.9(30.2・4.6X5)4-0.12.
20.脱式计算(能简算的要简算).
0.69X4.2+0.69X5.8
6.15X9.4-4.2
62.8+2.02X9.5
0.25X3.8X0.4
21.怎样算简便就怎样算•
17.17-6.8-3.2-6.17
5.4X[(1.3+2.15)4-0.2]
8.4^0.6+8.44-0.4
16.8X10.1
10.9-0.9^0.2+1.8
1.25X3.2X0.25.
22.用递等式进行计算,能简便的要简便简便计算.
3.18-(0.33+1.18)
[1-(0.5-0.25)]X0.6
0.389X4X0.25;
23・能简算的要简算.
4.05一0.81+2.4;
4.02X3.02+4.02X6.98;
0.6X[25-(8.7-3.7)]•
24.计算下面各题,能用简便算法的用简便算法
(1)12.25-3.1+0.85-6.17
(2)(1.9-1.9X0.9)一(3.8-2.8)
(3)2.65X1.7+1.35X1.7
(4)0.125X13.8X32X0.25.
25•计算,能简算的要简算.
(9.15-0.45X3.6)一0.3
26.递等式计算.
小数混合运算+简算
参考答案与试题解析
一.计算题(共19小题)
1.用简便方法计算.
3.7X4.5-4.4X3.7
0.25X0.25X4
3.84一1.9+0.16-1.1
9-74-2.5X0.4
5.5X[0.6724-(2+2.2)]
【解答】解:
(1)3.7X4.5-4.4X3.7
=3.7X(4.5-4.4)
=3.7X0.1
=0.37;
(2)0.25X0.25X4
=0.25X(0.25X4)
=0.25X1
=0.25;
(3)3.84-1.9+0.16-1.1
=(3.84+0.16)-(1.9+1.1)
=4・3
=1;
(4)9-7^25X0.4
=9・1.12
=7.88;
(5)5.5X[0.672子(2+2.2)]
=5.5X[0.672三4.2]
=5.5X0.16
二0.88.
2•计算下面各题,怎么简便怎么算.
35-0.8X31.8
4.6X5.9+5.9X5.4
24.4X2.5H-24.4X0.5
【解答】解:
(1)35-0.8X31.8
=35-25.44
=9.56
(2)4.6X5.9+5.9X5.4
=C4.6+5.4)X5.9
=10X5.9
=59
(2)24.4X2.54-24.4X0.5
=(24.414-24.4)X(2.5X0.5)
=1X1.25
=1.25
3.用递等式进行计算,能简便的要简便简便计算.
7.29X4.6+46X1.271(28.7-18.64-3.1)X0.816-5.32-4.68
3.7X0.125+6.3^840.8+14.74-(14.6-12.5)0.72+9.6三3.2
【解答】解:
①7.29X4.6+46X1.271
=7.29X4.6+4.6X12.71
二(7.29+12.71)X4.6
=20X4.6
=92;
2(28.7-18.64-3.1)X0.8
二(28.7-6)X0.8
=22.7X0.8
=18.16;
(3)16-5.32・4.68
=16-(5.32+4.68)
=16-10
=6;
④3.7X0.125+6.34-8二3.7X丄+6.3X1
88
=(3.7+63)X丄
8
二10乂丄
8
虽
4,
⑤40.8+14.74-(14.6-12.5)
二40.8+14.7—2.1
=40.8+7
=47.8;
=3.72.
4.用递等式计算,能简算的要简算.
28.74-7X4.5
9.6一(15.4-12.2)
4.6X1.2+2.8X4.6
934-3.14-0.3
【解答】解:
(1)28.74-7X4.5
二4.1X4.5
=18.45
(2)9.64-(15.4・12.2)
=9.64-3.2
=3
(3)4.6X1.2+2.8X4.6
=4.6X(1.2+2.8)
=4.6X4
=18.4
(4)93—0.3
=304-0.3
=100
5•计算题
12.5X88
50X9.9
2005X1.9+200.5X81.
【解答】解:
©12.5X88
=12.5X(80+8)
=12.5X80+12.5X8
=1000+100
=1100
250X9.9
=50X(10-0.1)
=50X10-50X0.1
=500-5
=495
33.68X68+5.32X68+68
=(3.68+5.32+1)X68
=10X68
=680
47.15X24.7+7.15X75.3
=7.15X(24.7+75.3)
=7.15X100
=715
52005X1.9+200.5X81
=2005X1.9+2005X8.1
=2005X(1.9+8.1)
=2005X10
=20050
6•计算(能简算要简算)
2.64+8.67+7.36+11.33
2.74X9.5+0.5X2.7
(2400-480X2.5)F1.6
16.8X10.1
1.25X88
6.87X[40一(3.49-3.09)]・
【解答】解:
①2.64+8.67+7.36+11.33
=(2.64+7.36)+(8.67+11.33)
=10+20
=30
22.74X9.5+0.5X2.7
=26.03+1.35
=27.38
3(2400-480X2.5)4-1.6
=(2400-1200)4-1.6
=12004-1.6
=750
@16.8X10.1
=16.8X(10+0.1)
=16.8X10+16.8X0.1
=168+1.68
=169.68
=1.25X80+1.25X8
=100+10
=110
66.87X[40一(3.49・3.09)]
=6.87X[404-0.4]
=6.87X100
=687
7.脱式计算,能简算的要简算.
42X10.1
(20+8.5)4-15
15.4X1.7+9.3X15.4-15.4.
【解答】解:
@42X10.1
=42X(10+0.1)
=42X10+42X0.1
=420+4.2
=424.2
2(20+8.5)4-15
二28.5一15
=1.9
315.4X1.7+9.3X15.4-15.4
=15.4X1.7+9.3X15.4-15.4X1
=15.4X(1.7+9.3-1)
=15.4X10
=154
8•计算下面各题,能简算的要简算.
90X4.5+45
3.8X1.96-3.8X0.46-3.8X0.5
(0.125+1.25+12.5+125)X8.
【解答】解:
(1)90X4.5+45
=9X45+45
二(9+1)X45
=10X45
=450
(2)3.8X1.96-3.8X0.46-3.8X0.5
=3.8X(1.96-0.46-0.5)
=3.8X1
=3.8
(3)(0.125+1.25+12.5+125)X8
=0.125X8+1.25X8+12.5X8+125X8
=1+10+100+1000
=1111
9.脱式计算,能简算的要简算.
4.8^2.044-2.4
1.1^(224-5)
2540X0.4
72+0.94-0.125
17.374-0.45-3.864-0.1
9.07-22.78^3.4+3.7.
【解答】解:
(1)4.84-2.04H-2.4
=24-2.04
=io
51
(2)1.1^(22H-5)
=1.1^22X5
=0.05X5
=0.25
(3)25一40X0.4
=25X0.44-40
=104-40
=0.25
(4)72+0.9—0.125
=72+7.2
=79.2
(5)17.374-0.45-3.86-F0.1
=38.6-3&6
=0
(6)9.07-22.784-3.4+3.7
=9.07-6.7+3.7
=2.37+3.7
=6.07
10・计算下列各题(能用简便算法的要用简便算法).
(4.15+0.65)X0.9
(2.3+1.054-2.1)X2.5
9.184-[(5.9-2.3)X0.25].
【解答】解:
(1)(4.15+0.65)X0.9
=4.8X0.9
=4.32;
(2)9.06X14.7+5.3X9.06
=9.06X(14.7+5.3)
=9.06X20
=181.2;
(3)(2.3+1.054-2.1)X2.5
=(2.3+0.5)
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