解比例
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(1)0.6:4.8=12:X,
0.6X=4.8×12,
0.6X÷0.6=57.6÷0.6,
X=96;
(2)
:2 3
=1.2:X,1 4
X=2 3
×1.2,1 4
X÷2 3
=0.3÷2 3
,2 3
X=0.45;
(3)45:X=18:26,
18X=45×26,
18X÷18=1170÷18,
X=65;
(4)9:0.09=X:0.15,
0.09X=0.15×9,
0.09X÷0.09=1.35÷0.09,
X=15;
(5)x:
=1 20
:3 4
,1 5
x:=1 5
×1 20
,3 4
x÷1 5
=1 5
÷3 80
,1 5
x=
;3 16
(6)(3.8-x):7=2:7,
(3.8-x)×7=2×7,
(3.8-x)×7÷7=14÷7,
3.8-x=2,
3.8-x+x=2+x,
3.8=2+x,
3.8-2=2+x-2,
x=1.8;
(7)
=0.8 X
,7 5
7X=0.8×5,
7X÷7=4÷7,
X=
;4 7
(8)x:
=0.3:5 7
,5 14
x=5 14
×0.3,5 7
x÷5 14
=5 14
÷3 14
,5 14
x=
;3 5
(9)
=1.6 6
,X 2.4
6X=1.6×2.4,
6X÷6=3.84÷6,
X=0.64;
(10)0.375:X=
:60%,1 20
X=0.375×60%,1 20
X÷1 20
=1 20
÷9 40
,1 20
X=
;9 2
(11)X:5=
:18 30
,1 2
X=5×1 2
,18 30
X÷1 2
=3÷1 2
,1 2
X=6;
(12)
=1.4 x
,0.4 15
0.4x=1.4×15,
0.4x÷0.4=21÷0.4,
x=52.5;
(13)
:X=0.25:6,2 5
0.25X=
×6,2 5
0.25X÷0.25=2.4÷0.25,
X=9.6;
(14)0.45:X=
:20,2 7
X=0.45×20,2 7
X÷2 7
=9÷2 7
,2 7
X=31.5;
(15)1.25:0.25=X:1.6,
0.25X=1.25×1.6,
0.25X÷0.25=2÷0.25,
X=8;
(16)X:48=3:1.2,
1.2X=48×3,
1.2X÷1.2=144÷1.2,
X=120;
(17)
:X=1:0.25,7 8
X=0.25×
,7 8
X=
;7 32
(18)
=1.6 X
,2.5 5
2.5X=1.6×5,
2.5X÷2.5=8÷2.5,
X=3.2;
(19)12:5=3.6:X,
12X=5×3.6,
12X÷12=18÷12,
X=1.5;
(20)X:0.25=4:3,
3X=0.25×4,
3X÷3=1÷3,
X=
;1 3
(21)1.5:X=3.6:4.8,
3.6X=1.5×4.8,
3.6X÷3.6=7.2÷3.6,
X=2;
(22)6.5:X=3
:4,1 4
3
X=4×6.5,1 4
3
X÷31 4
=26÷31 4
,1 4
X=8;
(23)0.6:1
=1 5
:X,4 5
0.6X=1
×1 5
,4 5
0.6X÷0.6=
÷0.6,24 25
X=
;8 5
(24)1.5:
=0.36:X,3 4
1.5X=
×0.36,3 4
1.5X÷1.5=0.27÷1.5,
X=0.18;
(25)0.75:X=1
:2,1 4
1
X=2×0.75,1 4
1
X÷11 4
=1.5÷11 4
,1 4
X=1.2;
(26)3.6:X=0.48:
,3 25
0.48X=3.6×
,3 25
0.48X÷0.48=0.432÷0.48,
X=0.9;
(27)1.25:0.2=X:1
,3 5
0.2X=1.25×1
,3 5
0.2X÷0.2=2÷0.2,
X=10;