题目内容
解方程.
| 3×7+4X=25 | 6X+18=48 | 7X-4X=18 | 9X-1.8=2.7. |
(1)3×7+4X=25
21+4x=25,
4x=4,
x=1;
(2)6X+18=48
6x=30,
x=5;
(3)7X-4X=18
3x=18,
x=6;
(4)9X-1.8=2.7
9x=4.5,
x=0.5.
21+4x=25,
4x=4,
x=1;
(2)6X+18=48
6x=30,
x=5;
(3)7X-4X=18
3x=18,
x=6;
(4)9X-1.8=2.7
9x=4.5,
x=0.5.
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