问题 解答题
解方程
8x+42=82
7
3
×6-30%=1.7
x
65%x-35%x=6.558%x+23%x=1.62.
答案

(1)8x+42=82,

8x+42-42=82-42,

8x=40,

8x÷8=40÷8,

x=5;

(2)

7
3
×6-30%=1.7x,

14-30%=1.7x,

13.7=1.7x,

13.7÷1.7=1.7x÷1.7,

x=8

1
17

(3)65%x-35%x=6.5,

30%x=6.5;

30%x÷30%=6.5÷30%,

x=21

2
3

(4)58%x+23%x=1.62,

81%x=1.62,

81%x÷81%=1.62÷81%,

x=2.

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