六年级解分式方程练习题及答案
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六年级解分数方程练习题及答案
5 1 5 2
(1)4.2-4X=1.8 (2)X=20×
(3)5X-3×=
8 4 21 7
5 1 5 2
解:4.2-4X=1.8 解:X=20× 解:5X-3×=
4X=4.2-1.8
4X=2.4
X
X=2.4÷4 X
X=0.6
X
(4)
5
8
X=
25
72
解:
5
8
X=
25
72
X=
25 5
72
÷
8
0.24X
X=
25 8
72
×
5
0.24X
X=
5
9
X
(7)
3 2
10
X-21×
3
=4
8 4
5
8
X=5
5X
=5÷
5
8
5X
=8
5X
(5)0.24X-1.8=4.2
解:0.24X-1.8=4.2
=4.2+1.8
=6 X
=6÷0.24
X
X=25 X
(8)
2 1
3
X÷
4
=12
21 7
-
5 2
7
=
7
=
2 5
7
+
7
=1
=1÷5
X=
1
5
(6)
8 1 16
9
X=
8
×
27
解:
8 1
9
X=
8
×
16
27
8
9
X=
2
27
=
2
27
÷
8
9
=
2 9
27
×
8
=
1
12
(9)3.6X÷2=2.16
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3 2 2 1
解:X-21×=4 解:X÷=12
解:3.6X÷2=2.16
10 3 3 4
3 2 1
X-14=4 X=12× 1.8X=2.16
10 3 4
3 2
X=4+14
X=3 X=2.16÷1.8
10 3
3
10
X=18 X=3÷
2
3
X
X=18÷
3 3
10
X=3×
2
X=60
X=
9
2
(10)X+
1
4
X=20 (11)2(X-2.6)=8
解:X+
1
4
X=20
解:2(X-2.6)=8
5
4
X=20
X-2.6=8÷2 6X
X=20÷
5
4
X-2.6=4
6X
X=16 X=4+2.6
X
X=6.6
X
(13)
2
5
X-
1
3
X=
3
10
(14)4X-6=38
解:
2
5
X-
1
3
X=
3
10
解:4X-6=38
1
3
15
X=
10
4X=38+6 X
=1.2
(12)6X+5=13.4
解:6X+5=13.4
=13.4-5
=8.4
=8.4÷6
=1.4
(15)5X=
15
19
解:5X=
15
19
=
15
19
÷5
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3 1 15 1
X=÷ 4X=44 X=×
10 15 19 5
3 3
X=×15
X=44÷4 X=
10 19
9
X=
X=11
2
(16)X÷
2 15
5
=
28
解:X÷
2 15
5
=
28
X=
15
28
×
2
5
X
X=
3
14
X
(19)
1
2
X-25%X=10
解:
1
2
X-25%X=10
0.25X=10
X=10÷0.25
X
X=40
X
(22)X-0.25=
1
4
(23)4
解:(22)X-0.25=
1
4
X-
1 1
4
=
4
0.7X
(17)
3
5
X=
25
72
(18)
1
2
X+
1
6
X=4
解:
3 25
5
X=
72
解:
1
2
X+
1
6
X=4
=
25 3 2
72
÷
5
3
X=4
=
5
24
X=6
(20)X+
7 3 4
8
X=
4
(21)X-
5
X=12
解:X+
7
8
X=
3 4
4
解:X-
5
X=12
15
8
X=
3
4
1
5
X=12
=
3
4
÷
15
8
X=12÷
1
5
=
2
5
X=60
+0.7X=102 (24)
2
3
X+
1
2
X=42
解:4+0.7X=102
解:
2 1
3
X+
2
X=42
=102-4
7
6
X=42
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1 1 7
X=+
0.7X=98 X=42÷
4 4 6
1 6
X= X=98÷0.7
X=42×
2 7
X=140
X=36
(25)4X-6×
2
3
=2
(26)
解:(25)4X-6×
2
3
=2
4X-4=2 X
4X=2+4
X
4X=6 X
X=
2
3
X
(25)
2
3
X÷
1
4
=12
(26)3X
解:
2
3
X÷
1
4
=12
2
3
X=12×
1
4
X
2
3
X=3
X
X=3÷
2
3
X
X=
9
2
12
5
÷X=
3
10
(27)9X÷0.7=9
解:
12 3
5
÷X=
10
解:9X÷0.7=9
=
12 3
5
÷
10
9X=9×0.7
=
12
5
×
10
3
9X=6.3
=20 X=6.3÷9
=0.7
=
3
8
(27)X÷
2
7
=
7
16
解:3X=
3 2
7
8
解:X÷
7
=
16
=
3
8
÷3
X=
7 2
16
×
7
=
1
7
8
X=
16
×
2
7
=
1
8
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3 1 4
(28)X+X=121 (29)25%+X=
(30)X-0.8X=16+6
8 10 5
3 1 4
解:X+X=121 解:25%+X= 解:X-0.8X=16+6
8 10 5
11 1 1 4
X=121
+X= 0.2X=22
8
X=121÷
11
8
X=88
(31)20X-8.5=1.5
(32)X
解:20X-8.5=1.5
X
20X=1.5+8.5 1.25X
20X=10
X
X=10÷20 X
X=
1
2
X
(34)X-
2
7
X=
3
4
(35)2X
解:X-
2
7
X=
3
4
5 3
7
X=
4
2X
4 10 5
1
10
X=
4 1
5
-
4
X
1
10
X=
11
20
X
X=
11 1
20
÷
10
X=
11
2
+25%X=90 (33)
(X
+25%X=90 (X
=90
(X
=90÷1.25 X
=72
X
+
2
5
=
3
5
(36)
解:2X+
2
5
=
3
5
=
3 2
5
-
5
X
=22÷0.2
=110
-32)×5=115
-32)×5=115
-32)=115÷5
-32=23
=23+32
=66
2 3
3
+X=
4
解:
2
3
+X=
3
4
=
3 2
4
-
3
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3 5 1 1
X=÷
2X= X=
4 7 5 12
21
1
X= X=
20 10
4
(37)X-X=21 (38)70%X+20%X=3.6
(39)8.8+4X=40
5
解:X-
4
5
X=21
1
5
X=21
0.9X
X=21÷
1
5
X
X=105 X
X
(40)4X-3×9=29 (41)
解:4X-3×9=29
4X-27=29
4X=29+27
4X=56 X
X=56÷4
X
X=14
(43)3X+5×0.3=4.5
(44)
解:70%X+20%X=3.6
=3.6
4X
=3.6÷0.9
=4 X
3
4
X+
1 3
4
=
8
(42)X
3
4
X+
1 3
4
=
8
X
3 3 1
4
X=
8
-
4
3 1
4
X=
8
X
=
1
8
÷
3
4
X
=
1
6
8 4
21
X=
15
(45)X
解:8.8+4X=40
=40-8.8
=31.2
=31.2÷4
=7.8
-
3
7
X=12
-
3
7
X=12
4
7
X=12
=12÷
4
7
=21
-15%X=68
4X
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8
4
解:3X+5×0.3=4.5 解:X=
解:X-15%X=68
21 15
4 8
3X+1.5=4.5
X=÷ 0.85X=68
15 21
4 21
3X=4.5-1.5 X=× X=68÷0.85
3X=3 X
X=3÷3
X=1
(46)X-
2 3
7
X=
4
(47)2X
解:X-
2 3
7
X=
4
5
7
X=
3
4
2X
X=
3 5
4
÷
7
2X
X=
3
4
×
5
7
X
X=
15
28
X
(49)
3
5
X=20×
1
4
(50) 5X
解:
3
5
X=20×
1
4
3
5
X=5
5X
15
=
7
10
X
+
2 3
5
=
5
(48)6X
解:2X+
2 3
5
=
5
=
3
5
-
2
5
6X
=
1
5
6X
=
1
5
÷2
X
=
1
10
X
-2.4×5=8 (51)
解:5X-2.4×5=8
-12=8 X
8
=80
+5=13.4
解:6X+5=13.4
=13.4-5
=8.4
=8.4÷6
=1.4
2
3
(X-4.5)=6
解:
2
3
(X-4.5)=6
-4.5=6÷
2
3
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3
X=5÷ 5X=8+12
X-4.5=9
5
5
X=5×
5X=20 X=9+4.5
3
25
X= X=4
X=13.5
3
3 5 5 2 1
(52)X+X=121
(53)5X-3×= (54)X÷=12
8 21 7 3 4
3 5 5 2 1
解:X+X=121 解:5X-3×=
解:X÷=12
8 21 7 3 4
11 5 5 2 1
X=121 5X-=
X=12×
8 7 7 3 4
11 5 5 2
X=121÷ 5X=+ X=3
8 7 7 3
8 10 2
X=121×
5X= X=3÷
11 7 3
2
9
X=88 X= X=
7 2
2 7 7 3 2
(55)X÷=
(56)X+X= (57)4X-6×=2
7 8 8 4 4
2 7 7 3 2
解:X÷= 解:X+X=
解:4X-6×=2
7 8 8 4 4
7 2 15 3
X=× X= 4X-3=2
8
7 8 4
1 3 15
X= X=÷
4X=2+3
4 4 8
2
X= 4X=5
5
4
X=
5
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12 3 4 25
8 1 18
(58) ÷X= (59)X=
(60)X=×
5 10 5 36 9 6 51
12 3 4
25 8 1 18
解:÷X= 解:X= 解:X=×
5 10 5 36 9 6 51
12 3 25 4 8
1
X=÷ X=÷ X=
5 10
(61)X÷
6
35
=
25
39
×
13
25
(62)
解:X÷
6
25 13
35
=
39
×
25
X÷
6 1
35
=
3
X=
1
3
×
6
35
X=
2
35
X
(63)4X+5=11.4 (63)4X
解:4X+5=11.4
4X=11.4-5 4X
4X=6.4
4X
X=6.4÷4 X
X=1.6
X
(64)5X=
15
19
(65)
36 5
2
3
X+
1
2
=
3
2
(63)
解:
2
3
X+
1 3
2
=
2
2 3 1
3
X=
2
-
2
2
3
X=1
X
=
3
2
X
+6=38 (63)X
解:4X+6=38
=38-6 X
=32
X
=32÷4
=8
8 4
21
X=
15
(66)
9 17
1
2
X+
1
6
X=4
解:
1
2
X+
1
6
X=4
2
3
X=4
=4÷
2
3
=6
÷
4
5
=
15
28
解:X÷
4 15
5
=
28
=
15 4
28 5
=
3
7
2
3
X÷
1
4
=16
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15 8 4 2 1
解:5X=
解:X= 解:X÷=16
19 21 15 3 4
15 4 8 2 1
X=÷5 X=÷
X=16×
19 15 21 3 4
3 4 8 2 1
X= X=÷ X=16×
19
X
X
X
(67)
2 5
5
X=
8
(68)
解:
2 5
5
X=
8
X=
5 2
8
÷
5
X=
5 2
8
×
5
X
X=
1
4
X
(70)4+0.8X=92 (71)
解:4+0.8X=92
0.8X=92-4
0.8X=88
X
15 21
=
4 21
15
×
8
=
7
10
X
8
9
X=
1
5
×
5
18
(69)X
解:
8
9
X=
1
5
×
5
18
8
9
X=
1
18
X
=
1
18
÷
8
9
X
=
1
16
X
2
3
X+
1
2
X=21
(72)X
解:
2
3
X+
1
2
X=21
7
6
X=21
=21÷
7
6
X
3
4
2
3
X=4
=4÷
2
3
=6
-0.25=
1
4
解:X-0.25=
1
4
-
1 1
4
=
4
=
1
4
+
1
4
=
1
2
+
1
4
X=105
解:X+
1
4
X=105
5
4
X=105
=105÷
5
4
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X=110
X=18 X=84
3 3
(73)X-X=400 (74)X-0.875X=8
(75)X+X=20
8 7
3 3
解:X-X=400
解:X-0.875X=8 解:X+X=20
8
5
8
X=400 0.125X=8
X=400÷
5
8
X=8÷0.125 X
X=640
X=64 X
(76)X×(
1
6
+
3
8
)=
13
12
(77)X-0.375X=
5
6
(78)
X
解:X×(
1 3 13 5
6
+
8
)=
12
解:X-0.375X=
6
X×
13
24
=
13
12
0.625X=
5
6
X=
13
12
÷
13
24
X=
5 5
6
÷
8
X=2
X=
4
3
X
7
10
7
X=20
=20÷
10
7
=14
-
2
7
X=
3
4
解:X-
2 3
7
X=
4
5
7
X=
3
4
=
3
4
÷
5
7
=
21
20
X