题目内容
解方程.
①3x+15×2=150
②x:1.6=2.4:0.6
③
x-
x=120.
①3x+15×2=150
②x:1.6=2.4:0.6
③
| 3 |
| 2 |
| 1 |
| 3 |
①3x+15×2=150,
3x+30=150,
3x+30-30=150-30,
3x=120,
3x÷3=120÷3,
x=40;
②x:1.6=2.4:0.6,
0.6x=1.6×2.4,
0.6x÷0.6=3.84÷0.6,
x=6.4;
③
x-
x=120,
(
-
)x=120,
x=120,
x×
=120×
,
x=
.
3x+30=150,
3x+30-30=150-30,
3x=120,
3x÷3=120÷3,
x=40;
②x:1.6=2.4:0.6,
0.6x=1.6×2.4,
0.6x÷0.6=3.84÷0.6,
x=6.4;
③
| 3 |
| 2 |
| 1 |
| 3 |
(
| 3 |
| 2 |
| 1 |
| 3 |
| 7 |
| 6 |
| 7 |
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| 6 |
| 7 |
| 6 |
| 7 |
x=
| 720 |
| 7 |
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