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求未知数x. 4+0.7x=10223x+12x=422:35=x:2.7.

编辑:chaxungu时间:2026-04-27 13:37:46分类:小学数学题库

求未知数x.
4+0.7x=102
2
3
x+
1
2
x=42
2:
3
5
=x:2.7.
(1)4+0.7x=102,
4+0.7x-4=102-4,
0.7x=98,
0.7x÷0.7=98÷0.7,
x=140;

(2)
2
3
x+
1
2
x=42,
7
6
x=42,
7
6
7
6
=42÷
7
6

x=36;

(3)2:
3
5
=x:2.7,
3
5
x=2×2.7,
3
5
x=5.4,
3
5
3
5
=5.4÷
3
5

x=9.