题目内容
解方程.
2-
x=1 8x-7×2.3=32.9 x÷25×4=80.
2-
| 2 |
| 3 |
(1)2-
x=1,
2-
x+
x=1+
x,
1+
x=2,
1+
x-1=2-1,
x÷
=1÷
,
x=
;
(2)8x-7×2.3=32.9,
8x-16.1=32.9,
8x-16.1+16.1=32.9+16.1,
8x÷8=49÷8,
x=6
;
(3)x÷25×4=80,
x÷25×4÷4=80÷4,
x÷25=20,
x÷25×25=20×25,
x=500.
| 2 |
| 3 |
2-
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
1+
| 2 |
| 3 |
1+
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
x=
| 3 |
| 2 |
(2)8x-7×2.3=32.9,
8x-16.1=32.9,
8x-16.1+16.1=32.9+16.1,
8x÷8=49÷8,
x=6
| 1 |
| 8 |
(3)x÷25×4=80,
x÷25×4÷4=80÷4,
x÷25=20,
x÷25×25=20×25,
x=500.
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