题目内容
解方程:
x=
2.8x÷2=7
0.4x+2.8x=96.
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2.8x÷2=7
0.4x+2.8x=96.
(1)
x=
,
x÷
=
÷
,
x=1.5;
(2)2.8x÷2=7,
2.8x÷2×2=7×2,
2.8x÷2.8=14÷2.8,
x=5;
(3)0.4x+2.8x=96,
3.2x=96,
3.2x÷3.2=96÷3.2,
x=30.
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| 2 |
| 3 |
| 4 |
| 1 |
| 2 |
| 1 |
| 2 |
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| 4 |
| 1 |
| 2 |
x=1.5;
(2)2.8x÷2=7,
2.8x÷2×2=7×2,
2.8x÷2.8=14÷2.8,
x=5;
(3)0.4x+2.8x=96,
3.2x=96,
3.2x÷3.2=96÷3.2,
x=30.
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