问题 解答题
求未知数X的值.
2
3
x﹢
1
2
=42
X
24
=3:85X-12.5=25.
答案

(1)

2
3
x﹢
1
2
=42,

2
3
x﹢
1
2
-
1
2
=42-
1
2

2
3
x÷
2
3
=41
1
2
÷
2
3

x=62

1
4

(2)

X
24
=3:8,

8x=3×24,

8x÷8=72÷8,

x=9;

(3)5X-12.5=25,

5X-12.5+12.5=25+12.5,

5x÷5=37.5÷5,

x=7.5.

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