题目内容
求未知数X.
| 20:40%X=
|
(1)
×16-5X=7,
18-5x+5x=7+5x,
18-7=7+5x-7,
11÷5=5x÷5,
x=2.2;
(2)20:40%X=
,
2×40%x=20×5,
80%x=100,
80%x÷80%=100÷80%,
x=125.
| 9 |
| 8 |
18-5x+5x=7+5x,
18-7=7+5x-7,
11÷5=5x÷5,
x=2.2;
(2)20:40%X=
| 2 |
| 5 |
2×40%x=20×5,
80%x=100,
80%x÷80%=100÷80%,
x=125.
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