
解方程. 38x+12.5%x-25
展开全部
(1)
x+12.5%x-
=
,
(
+
)x-
=
,
x-
=
,
x-
+
=
+
,
x=
,
x×2=
×2,
x=
;
(2)62-3.28x-2.32x=22.8,
62-(3.28+2.32)x=22.8,
62-5.6x=22.8,
62-5.6x+5.6x=22.8+5.6x,
22.8+5.6x-22.8=62-22.8,
5.6x=39.2,
5.6x÷5.6=39.2÷5.6,
x=7.
3 |
8 |
2 |
5 |
4 |
7 |
(
3 |
8 |
1 |
8 |
2 |
5 |
4 |
7 |
1 |
2 |
2 |
5 |
4 |
7 |
1 |
2 |
2 |
5 |
2 |
5 |
4 |
7 |
2 |
5 |
1 |
2 |
34 |
35 |
1 |
2 |
34 |
35 |
x=
68 |
35 |
(2)62-3.28x-2.32x=22.8,
62-(3.28+2.32)x=22.8,
62-5.6x=22.8,
62-5.6x+5.6x=22.8+5.6x,
22.8+5.6x-22.8=62-22.8,
5.6x=39.2,
5.6x÷5.6=39.2÷5.6,
x=7.
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