问题
解答题
解方程. (1)9x+3=30; (2)75x=25×12; (3)
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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)
÷x=7÷1 4 1 3
=211 4x
×4x=21×4x1 4x
84x=1
84x÷84=1÷84
x=
.1 84
解方程. (1)9x+3=30; (2)75x=25×12; (3)
|
(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)
÷x=7÷1 4 1 3
=211 4x
×4x=21×4x1 4x
84x=1
84x÷84=1÷84
x=
.1 84