题目内容
解方程.
| 10x+18=50 |
| 8x-4.2=7.8. |
10x+18=50,
10x-18=50-18,
10x=32,
10x÷10=32÷10,
x=3.2,
x+
x=10,
(
+
)x=10,
x=10,
x÷
=10÷
,
x=8,
8x-4.2=7.8,
8x-4.2+4.2=7.8+4.2,
8x=12,
8x÷8=12÷8,
x=
.
10x-18=50-18,
10x=32,
10x÷10=32÷10,
x=3.2,
| 3 |
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(
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x=8,
8x-4.2=7.8,
8x-4.2+4.2=7.8+4.2,
8x=12,
8x÷8=12÷8,
x=
| 3 |
| 2 |
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