解方程或比例2.1Ⅹ+7.9Ⅹ=0.
解方程或比例2.1Ⅹ+7.9Ⅹ=0.29(358+3Ⅹ)×0.5=214:0.5=125:Ⅹ0.75x=1.232....
解方程或比例2.1Ⅹ+7.9Ⅹ=0.29(358+3Ⅹ)×0.5=214:0.5=125:Ⅹ0.75x=1.232.
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(1)2.1Ⅹ+7.9Ⅹ=0.29,
(2.1+7.9)X=0.29,
10X=0.29,
10X÷10=0.29÷10,
X=0.029;
(2)(3
+3Ⅹ)×0.5=2,
(3
+3Ⅹ)×0.5÷0.5=2÷0.5,
3
+3Ⅹ=4,
3
+3Ⅹ-3
=4-3
,
3Ⅹ=
,
3Ⅹ÷3=
÷3,
X=
×
,
X=
;
(3)
:0.5=1
:Ⅹ,
0.25:0.5=1.4:X,
0.25X=0.5×1.4,
0.25X=0.7,
0.25X÷0.25=0.7÷0.25,
X=2.8;
(4)
=
,
1.23x=0.75×2,
1.23x=1.5,
1.23x÷1.23=1.5÷1.23,
x=
.
(2.1+7.9)X=0.29,
10X=0.29,
10X÷10=0.29÷10,
X=0.029;
(2)(3
5 |
8 |
(3
5 |
8 |
3
5 |
8 |
3
5 |
8 |
5 |
8 |
5 |
8 |
3Ⅹ=
3 |
8 |
3Ⅹ÷3=
3 |
8 |
X=
3 |
8 |
1 |
3 |
X=
1 |
8 |
(3)
1 |
4 |
2 |
5 |
0.25:0.5=1.4:X,
0.25X=0.5×1.4,
0.25X=0.7,
0.25X÷0.25=0.7÷0.25,
X=2.8;
(4)
0.75 |
x |
1.23 |
2 |
1.23x=0.75×2,
1.23x=1.5,
1.23x÷1.23=1.5÷1.23,
x=
50 |
41 |
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