题目内容
解方程.
| x÷25%=0.4 | x:
| 55%x+x=3.1 | x-40%x=36. |
(1)x÷25%=0.4,
x÷0.25×0.25=0.4×0.25,
x=0.1;
(2)x:
=0.12,
x=0.12×
,
x=0.02;
(3)55%x+x=3.1,
1.55x=3.1,
1.55x÷1.55=3.1÷1.55,
x=2;
(4 )x-40%x=36,
x-0.4x=36,
0.6x=36,
0.6x÷0.6=36÷0.6,
x=60.
x÷0.25×0.25=0.4×0.25,
x=0.1;
(2)x:
| 1 |
| 6 |
x=0.12×
| 1 |
| 6 |
x=0.02;
(3)55%x+x=3.1,
1.55x=3.1,
1.55x÷1.55=3.1÷1.55,
x=2;
(4 )x-40%x=36,
x-0.4x=36,
0.6x=36,
0.6x÷0.6=36÷0.6,
x=60.
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