小学分数方程专项练习180题.doc
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小学分数方程专项练习180题.doc
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分数方程专项练习180题(有答案)
(1)+X=,
(2)X﹣=,
(3)x+x=42,
(4)=,
(5)5x﹣3×=,
(6)x+=,
(7)+2x=,
(8)12÷(x+)=1.2,
(9)
(10)
(11)X×2=4×5,,
(12)X﹣X=,
(13)90×+x=20,
(14)0.2x+=8﹣x,
(15)X+(3X﹣16)÷=10(X+1),
(15)=,
(16)X﹣X=1,
(17)x+x=42
(18),
(19)﹣=1,
(20)2X+1=2,
(21)﹣x=
(22)x+2=4.25
(23)x﹣(1+)=4.5
(24)37.5++x=69
(25),
(26)x=2.4×5,
(27)x﹣+=,
(28)x+x=121,
(29)(x+)×7=8.1,
(30)=,
(31)4x+=5,
(32)+x=9,
(33)x﹣x=,
(34)x+x=11,
(35)2x+=4.625,
(36)﹣2X=,
(37)x﹣x=2,
(38)+21.5=x,
(39)﹣3x=,
(40)+x=,
(41)x+5×4=95
(42)x﹣x=
(43)﹣3χ=,
(44)x﹣x=0.2,
(45)y﹣4﹣y=18,
(45),
(46)×3+2.75x=,
(47),
(48)5x﹣3×=,
(49)x=,
(50)x+x=39,
(51)7x﹣3x=,
(52)x+=,
(53)﹣=,
(54),
(54),
(55)5x﹣=34
(56)x﹣×6=
(57)x+1.2x=25
(58)8﹣4.5x=,
(59)x﹣0.95×4=8.5,
(60)2x﹣=2+,
(61)x+x=,
(62)x﹣=2﹣,
(63)﹣=2.5,
(64)x=18,
(65)x﹣=,
(66)x﹣x=,
(67),
(68),
(69)x﹣x=,
(70)1.25:
0.25=,
(71)1﹣x=,
(72)x+x=,
(73)x+x=42,
(74)x+0.25=,
(75)x=10×,
(76)x+x=2,
(77)x×(1﹣37.5%)=,
(78)(x+)=2,
(79)x=50×,
(80)x+x=42,
(81)4+x=102,
(82)X+X=,
(83)X=,
(84)(1﹣)X=,
(85)χ﹣χ=,
(86)χ=42×,
(87)8x﹣×3=,
(88)+=1,
(89)3x﹣×=50%,
(90)3x﹣x=,
(91)+x=,
(92)﹣x=×,
(93)÷x=0.8,
(94)x+5×4=95,
(95)x﹣x﹣4=18,
(96)÷ⅹ=,
(97)x×=4,
(98)ⅹ=,
(99)ⅹ﹣6=7,
(100)+5x=110,
(101)x﹣4=60,
(102)x﹣x=9,
(103)x﹣x=3.6,
(104)÷x=
(105)=9.1,
(106)4(+x)=,
(107)×0.25+x=,
(108)x+x=,
(109),
(110),
(111)+3x=,
(112)=,
(113)×﹣X=,
(114)x÷=30,
(115)﹣x=7,
(116)x=×10,
(117)X﹣X=6,
(118)X﹣2=13,
(119)(1﹣)X=480,
(120)6X+X=39,
(121)2.4﹣=3.2﹣x,
(122),
(123),
(124)X﹣X=,
(125)6X+4.5=,
(126)80%X﹣0.6=4.2,
(127)X+X=,
(128)X+X=,
(129)÷x=,
(130)x÷=42,
(131)x+=,
(132)X﹣=,
(133)X+X=3,
(134)X+=×8,
(134),
(135),
(136)x﹣7.5=,
(137)2X+=1,
(138)X÷=,
(139)X﹣X=1.5,
(140)x=28×,
(141)(x+3)×=48,
(142)x﹣=,
(143),
(144)2÷x=2,
(145)3﹣4x=2,
(146)x÷=÷
(147)÷x=÷.
(148)X﹣25%X=135,
(149)X﹣12.5×4=0,
(150)x+×=1,
(151)x×(﹣)=,
(152)8×﹣1.5x=1.1,
(153)xx=2,
(154)x﹣=,
(155)x﹣x=15,
(156)X÷=,
(157)(X﹣)=,
(158)X+X=×,
(159)﹣x=,
(160)x+0.75﹣=0.15,
(161)2x+=4.625,
(162)÷4.8x=15.8,
(163)x=14,
(164)x+x=2.1,
(165)2.7÷120%x=9,
(166)(13﹣X)×=6,
(167)x﹣21×=4
(168)1x+x=
(168)x×(﹣)=
(169)2+x=5,
(170)4x﹣=;
(171)x÷=
(172)x﹣x=3
(173)6x﹣3.5x=÷
(174)﹣3X=
(175)
(176)5X﹣3×
(177)x××=5
(178)χ=,
(179)χ+χ=,
(180)x=
(181)x+15=40
(182)x÷=
专项练习参考答案:
(1)+X=,
+X﹣=﹣,
X=;
(2)X﹣=,
X﹣+=+,
X=;
(3)x+x=42,
(+)x=42,
x=42,
x×=42×,
x=36;
(4)=,
4.5x=8,
4.5x÷4.5=8÷4.5,
x=
(5)5x﹣3×=,
5x﹣,
5x,
5x÷5=,
x=0.7
(6)x+=,
x+﹣=﹣,
x=,
x÷=÷,
x=;
(7)+2x=,
+2x﹣=﹣,
2x÷2=÷2,
x=;
(8)12÷(x+)=1.2,
12÷(x+)×(x+)=1.2×(x+),
1.2×(x+)=12,
1.2×(x+)÷1.2=12÷1.2,
x+﹣=10﹣,
x=9.
(9)
x=,
x÷=4÷,
x=;
(10)
,
3x﹣+=+,
,
3x÷3=÷3,
.
(11)X×2=4×5,,
X=20,
X×=20×,
X=15
(12)X﹣X=,
(1﹣)X=,
X=,
X×3=×3,
X=
(13)90×+x=20,
15+x=20,
15+x﹣15=20﹣15,
x×2=5×2,
x=10;
(14)0.2x+=8﹣x,
0.2x++x=8﹣x+x,
1.8x+=8,
1.8x+﹣=8﹣,
1.8x=7.2,
1.8x÷1.8=7.2÷1.8,
x=4
(15)X+(3X﹣16)÷=10(X+1),
X+(3X﹣16)×4=10X+10,
X+12X﹣64=10X+10,
13X﹣64=10X+10,
13X﹣64+64=10X+10+64,
13X=10X+74,
13X﹣10X=10X+74﹣10X,
3X=74,
3X÷3=74÷3,
X=
(15)=,
+2x=+2x,
+2x=,
+2x﹣=﹣,
2x=1,
2x÷2=1÷2,
x=0.5
(16)X﹣X=1,
(﹣)X=1,
X=1,
X×2=1×2,
X=2;
(17)x+x=42
(+)x=42
x=42
x=42÷
x=36
(18),
=,
=,
=﹣,
=,
÷=÷,
x=
(19)﹣=1,
(﹣)×6=1×6,
4x+2﹣3x+3=6,
x+5=6,
x+5﹣5=6﹣5,
x=1
(20)2X+1=2,
2X+1=2,
2X÷2=÷2,
X=
(21)﹣x=
x=﹣
x=﹣
x=;
(22)x+2=4.25
x=4.25﹣2
x=4﹣2
x=3﹣2
x=1;
(23)x﹣(1+)=4.5
x﹣(1+)=4.5
x﹣1=4.5
x=4.5+1
x=4+1
x=4+1
x=6;
(24)37.5++x=69
37.5+0.2+x=69.5
37.7+x=69.5
x=69.5﹣37.7
x=31.8
(25),
,
,
,
x=18
(26)x=2.4×5,
x×6=12×6,
x=72;
(27)x﹣+=,
x﹣=,
x﹣=,
x=
(28)x+x=121,
x=121,
,
x=132;
(29)(x+)×7=8.1,
7x+6=8.1,
7x+6﹣6=8.1﹣6,
7x÷7=2.1÷7,
x=0.3;
(30)=,
×3.6=×3.6,
x=15
(31)4x+=5,
4x+=5,
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