问题 解答题
解方程.
(1)9x+3=30;
(2)75x=25×12;
(3)
1
4
÷x=7÷
1
3
答案

(1)9x+3=30

9x+3-3=30-3

9x=27

9x÷9=27÷9

x=3;

(2)75x=25×12

75x=300

75x÷75=300÷75

x=4;

(3)

1
4
÷x=7÷
1
3

1
4x
=21

1
4x
×4x=21×4x

84x=1

84x÷84=1÷84

x=

1
84

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