题目内容
解方程.
χ+15=40
χ-0.7χ=2.1.
| 5 |
| 7 |
χ-0.7χ=2.1.
(1)
x+15=40,
x+15-15=40-15,
x×
=25×
,
x=35.
(2)x-0.7x=2.1,
0.3x=2.1,
0.3x÷0.3=2.1÷0.3,
x=7.
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
| 7 |
| 7 |
| 5 |
| 7 |
| 5 |
x=35.
(2)x-0.7x=2.1,
0.3x=2.1,
0.3x÷0.3=2.1÷0.3,
x=7.
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