题目内容
求未知数.
(1)3.5-2.5x=0.375
(2)10.8:4=x:7.
(1)3.5-2.5x=0.375
(2)10.8:4=x:7.
(1)3.5-2.5x=0.375,
3.5-2.5x+2.5x=0.375+2.5x,
3.5=2.5x+0.375,
3.5-0.375=2.5x+0.375-0.375,
2.5x=3.125,
2.5x÷2.5=3.125÷2.5,
x=1.25;
(2)10.8:4=x:7,
4x=10.8×7,
x=
,
x=18.9.
3.5-2.5x+2.5x=0.375+2.5x,
3.5=2.5x+0.375,
3.5-0.375=2.5x+0.375-0.375,
2.5x=3.125,
2.5x÷2.5=3.125÷2.5,
x=1.25;
(2)10.8:4=x:7,
4x=10.8×7,
x=
| 10.8×7 |
| 4 |
x=18.9.
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