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解方程 x-35x=36 42:35=x:57 0.75x=4.53.

编辑:chaxungu时间:2026-04-27 13:37:48分类:小学数学题库

解方程
x-
3
5
x=36
42:
3
5
=x:
5
7
0.75
x
=
4.5
3
(1)x-
3
5
x=36,
2
5
x=36,
2
5
2
5
=36÷
2
5

x=90;

(2)42:
3
5
=x:
5
7

3
5
x=42×
5
7

3
5
3
5
=30÷
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.