题目内容
解比例与方程.
|
x+30%x=52 | x-25%x=15 | x:5=1.5:6. |
(1)
=
,
32x=21×8,
32x÷32=21×8÷32,
x=
;
(2)x+30%x=52,
130%x=52,
130%x÷130%=52÷130%,
x=40;
(3)x-25%x=15,
75%x=15,
75%x÷75%=15÷75%,
x=20;
(4)x:5=1.5:6,
6x=1.5×5,
6x÷6=7.5÷6,
x=1.25.
| 21 |
| x |
| 32 |
| 8 |
32x=21×8,
32x÷32=21×8÷32,
x=
| 21 |
| 4 |
(2)x+30%x=52,
130%x=52,
130%x÷130%=52÷130%,
x=40;
(3)x-25%x=15,
75%x=15,
75%x÷75%=15÷75%,
x=20;
(4)x:5=1.5:6,
6x=1.5×5,
6x÷6=7.5÷6,
x=1.25.
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解比例与方程.
| x+30%x=52 | x-25%x=15 | x:5=1.5:6. |