分数乘除法方程【专项练习+参考答案】

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x=1 ;
(23)x﹣(1 + )=4.5 x=121, x﹣(1 + )=4.5 , x﹣1 =4.5 x=4.5+1 (29) (x+ )×7=8.1, x=4 +1 x=4 +1 x=6 ; (30) (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 ×3.6= 7x+6=8.1, 7x+6﹣6=8.1﹣6, 7x÷7=2.1÷7, x=0.3; = , ×3.6, x=132;
(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)
8
(149) X﹣12.5×4=0
(150) x+ × =1
(151) ( ﹣ ) x=
(152) 8× ﹣1.5x=1.1
(153) x
x=2
(154) x﹣ =
(155)x﹣ x=15
(156)X÷ =
(157) (X﹣ )=
(158) X+ X= ×
(159) ﹣x=
(160)x+0.75﹣ =0.15
(121)2.4﹣ =3.2﹣x
(122)
(123)
(124)X﹣ X=
(125)6X+4.5=
(126)0.8X﹣0.6=4.2
(127) X+
X=
(128) X+ X=
(129)
÷x=
(130)x÷
=42
(131) x+ =
(132) X﹣ =
(133) X+ X=3
7
(134) X+ = ×8
X×2=1×2, 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﹣ 0.2x+ + x=8﹣ x, = 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= (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 , , = ÷ , ﹣ , = , = , X=2; (17) x+ x=42 ( + )x=42 x=42 x=42÷ x=36 (18) ,
(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÷ =
(183)
=
10
分数乘除法解方程【参考答案】
(1) +X= , +X﹣ = ﹣ , X= ; (2)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÷ (5)5x﹣3× 5x﹣ 5x 5x÷5= x=0.7 (6) x+ = , x+ ﹣ = ﹣ , x= , x÷ = ÷ , 3x÷3= = , x= , (10) , , , 3x﹣ + = + , ÷3, . (11) X×2=4×5, , , ; =4÷ ,
(91) +x=
(92) ﹣x= ×
(93)
÷x=0.8
5
(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
(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﹣ X=135
(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
3
(58)8﹣4.5x=
(59) x﹣0.95×4=8.5
14﹣48x=11, 48x+11=14, 48x+11﹣11=14﹣11, 48x=3, 48x÷48=3÷48, x= (40) + x= , 3x+1=2, 3x+1﹣1=2﹣1, 3x=1, 3x÷3=1÷3, x= ; (41) x+5×4=95 x+20=95 x=95﹣20 x=75 x=75÷ x=125 (42)x﹣ x= , ;
3x= 3x÷3= x=
, ÷3, 5x﹣ 5x﹣ +
(44) x﹣ x=0.2, ( ﹣ )x=0.2, 5x÷5= x=0.2, x=8.4; (45)y﹣4﹣ y=18, y﹣4=18, y﹣4+4=18+4, y =22 y=88 (45) x÷ = × ÷ x= ; (46) ×3+2.75x= +2.75x= , ﹣ , , , x× , =39× x=24; (51)7x﹣3x= 4x= 4x÷4= x= , , ÷4, , , (49) x= , x× = × , x=1.5; (50)x+ x=39, x=39, x=
)×2=(2+
4x﹣x﹣1=4+x+1, 3x﹣1=x+5, 3x﹣1+1=x+5+1,
16
3x=x+6, 3x﹣x=x+6﹣x, 2x=6, 2x÷2=6÷2, x=3 (61) x+ x= ,
x÷ = ÷ , x= ; , , ÷ ,
(66)x﹣ x= x=
x= ; x÷ = (62)x﹣ =2﹣ , (67) x= , , x=1; (68) , x﹣ = , , x﹣ + = + , x=2 =2.5, )×12=2.5×12, (69)x﹣ x= , 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=
11
X=20, X× =20× , X=15 (12)X﹣ X= , X=1, (1﹣ )X= , (16) X﹣ ( ﹣
X= X=1, )X=1,
2.75x=1 , 2.75x÷2.75=1 x= x﹣3.8+3.8=8.5+3.8, (55)5x﹣ =34 x=12.3, 5x﹣ + =34+ x÷ =12.3÷ , 5x=34 5x÷5=34 ÷5 x=6.95; (56) x﹣ ×6= (60)2x﹣ (2x﹣ x=16.4; =2+ , )×2, 2.75, x﹣3.8=8.5,
=
(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=
2
(40) + x=
(41) x+5×4=95
(42)x﹣ x=
(43) ﹣3χ=
(44) x﹣ x=0.2
(106)4( +x)=
(107) ×0.25+ x=
(108) x+ x=
(109)
(110)
(111) ቤተ መጻሕፍቲ ባይዱ3x=
(112)
=
(113) × ﹣X=
6
(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
(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
(37)x﹣ x=2, x= ,
14
x
= x= ;

2.75x= 2.75x÷2.75=
, ÷2.75,
(43) ﹣3χ= ﹣3χ+3x= 3x+ 3x+

x= ;
+3x, (47) = , = ﹣ , , 5x=4.8, 5x÷5=4.8÷5, x=0.96; (48)5x﹣3× = , = , = + 5x= , ÷5, . ,
(77) (1﹣0.375)x =
4
(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﹣ × =0.5
(90)3x﹣ x=
12
2X÷2= X= (21) ﹣x=
÷2,
(25)
, , ,
x= x= x=
﹣ ﹣ ; x×6=12×6, x=18 (26) x=2.4×5,

(22)x+2
=4.25 x=4.25﹣2 x=4 x=3 ﹣2 ﹣2 x﹣ (27)x﹣
x=72; + = , x﹣ = , = x= (28) x+ x=121, ,
+2.75x﹣ =
15
(52) x+ = x+ ﹣ = =
, ﹣ , ,
x﹣4.8= x﹣4.8+4.8= +4.8 x=5.55 x÷ =5.55÷ x=18.5 (57) x+1.2x=25 +1.2)x=25, 5x=25, 5x÷5=25÷5, x=5; (58)8﹣4.5x= , 8﹣4.5x+4.5x= , +4.5x,
x=15 (31)4x+ =5, 4x+ =5 ,
13
4x÷4= x= (32) +x=9, +x =9 x= , ; ;

x=2, x× =2× , x= ; (38) +21.5= x, 22= x, 22× = x× .
(33) x﹣ x= , x= x= , (39) ﹣3x= x×6= ×6, x=5; (34) x+ x=11, x=11, x× x= (35)2x+ =4.625, 2x+ ﹣ =4.625﹣ , 2x=4, x=2, (36) ﹣2X= , ﹣2x+2x﹣ = +2x﹣ , =2x, 2x= x= , , =11× , ,
(161)2x+ =4.625
(162)
÷4.8x=15.8
(163)
x=14
(164)x+ x=2.1
9
(165)2.7÷120%x=9
(166) (13﹣X)× =6
(167)
x﹣21× =4
(168)1 x+ x=
(168)x×( ﹣ )=
(169)2
+x=5
(170)4x﹣ =
(171)x÷ =
x= ; (53) ﹣ = ,
( ﹣ )x= , ( x= , x÷ x= (54) = ÷ ,
0.9+x=3.2﹣x+x, 0.9+x﹣0.9=3.2﹣0.9, x=2.3; (54) 4.5+2.75x﹣4.5= , ﹣4.5,
+4.5x=8, +4.5x﹣ =8﹣ ,
4.5x=4.5, 4.5x÷4.5=4.5÷4.5, x=1; (59) x﹣0.95×4=8.5,
分数乘除法解方程【专项练习】
(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)
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