(2010•武义县)解方程或比例
来源:学生作业帮 编辑:大师作文网作业帮 分类:综合作业 时间:2024/09/24 09:24:34
(2010•武义县)解方程或比例
2.1Ⅹ+7.9Ⅹ=0.29
(3
2.1Ⅹ+7.9Ⅹ=0.29
(3
5 |
8 |
(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
5
8+3Ⅹ)×0.5=2,
(3
5
8+3Ⅹ)×0.5÷0.5=2÷0.5,
3
5
8+3Ⅹ=4,
3
5
8+3Ⅹ-3
5
8=4-3
5
8,
3Ⅹ=
3
8,
3Ⅹ÷3=
3
8÷3,
X=
3
8×
1
3,
X=
1
8;
(3)
1
4:0.5=1
2
5: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)
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.
(2.1+7.9)X=0.29,
10X=0.29,
10X÷10=0.29÷10,
X=0.029;
(2)(3
5
8+3Ⅹ)×0.5=2,
(3
5
8+3Ⅹ)×0.5÷0.5=2÷0.5,
3
5
8+3Ⅹ=4,
3
5
8+3Ⅹ-3
5
8=4-3
5
8,
3Ⅹ=
3
8,
3Ⅹ÷3=
3
8÷3,
X=
3
8×
1
3,
X=
1
8;
(3)
1
4:0.5=1
2
5: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)
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.