问题
解答题
解方程
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答案
(1)x-
x=36,3 5
x=36,2 5
x÷2 5
=36÷2 5
,2 5
x=90;
(2)42:
=x:3 5
,5 7
x=42×3 5
,5 7
x÷3 5
=30÷3 5
,3 5
x=50;
(3)
=0.75 x
,4.5 3
4.5x=0.75×3,
4.5x÷4.5=2.25÷4.5,
x=0.5.