题目内容
解方程.
| ①15+5X=25 | ②5X-1.8X=24 | ③3(X+2.1)=10.5. |
①15+5X=25
15+5X-15=25-15,
5x=10,
5x÷5=10÷5,
x=2;
②5X-1.8X=24,
3.2x=24,
3.2x÷3.2=24÷3.2,
x=7.5;
③3(X+2.1)=10.5,
3(X+2.1)÷3=10.5÷3,
x+2.1-2.1=3.5-2.1,
x=1.4.
15+5X-15=25-15,
5x=10,
5x÷5=10÷5,
x=2;
②5X-1.8X=24,
3.2x=24,
3.2x÷3.2=24÷3.2,
x=7.5;
③3(X+2.1)=10.5,
3(X+2.1)÷3=10.5÷3,
x+2.1-2.1=3.5-2.1,
x=1.4.
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