题目内容
求未知数x.
x-7.5=4.5
=
.
0.4×(x-8)=10.
| 2 |
| 3 |
| 0.6 |
| x |
| 2 |
| 3 |
0.4×(x-8)=10.
(1)
x-7.5=4.5,
x-7.5+7.5=4.5+7.5,
x=12,
x÷
=12÷
,
x=18;
(2)
=
,
2x=0.6×3,
2x÷2=1.8÷2,
x=0.9;
(3)0.4×(x-8)=10,
0.4×(x-8)÷0.4=10÷0.4,
x-8=25,
x-8+8=25+8,
x=33.
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
x=18;
(2)
| 0.6 |
| x |
| 2 |
| 3 |
2x=0.6×3,
2x÷2=1.8÷2,
x=0.9;
(3)0.4×(x-8)=10,
0.4×(x-8)÷0.4=10÷0.4,
x-8=25,
x-8+8=25+8,
x=33.
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