问题 解答题
解方程:
(1)(
5
6
+
5
8
)x=
7
20
(2)(1-25%)x=36(3)30%x=90(4)x+20%x=40.
答案

(1)(

5
6
+
5
8
)x=
7
20

35
24
x=
7
20

35
24
x÷
35
24
=
7
20
÷
35
24

x=

6
25

(2)(1-25%)x=36,

75%x=36,

75%x÷75%=36÷75%,

x=48;

(3)30%x=90,

30%x÷30%=90÷30%,

x=300;

(4)x+20%x=40,

120%x=40,

120%x÷120%=40÷120%,

x=3

1
3

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