题目内容
解方程.
(1)9x+3=30;
(2)75x=25×12;
(3)
÷x=7÷
.
(1)9x+3=30;
(2)75x=25×12;
(3)
| 1 |
| 4 |
| 1 |
| 3 |
(1)9x+3=30
9x+3-3=30-3
9x=27
9x÷9=27÷9
x=3;
(2)75x=25×12
75x=300
75x÷75=300÷75
x=4;
(3)
÷x=7÷
=21
×4x=21×4x
84x=1
84x÷84=1÷84
x=
.
9x+3-3=30-3
9x=27
9x÷9=27÷9
x=3;
(2)75x=25×12
75x=300
75x÷75=300÷75
x=4;
(3)
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4x |
| 1 |
| 4x |
84x=1
84x÷84=1÷84
x=
| 1 |
| 84 |
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