问题 解答题
求未知数x.
(l)
3
28
=
x
15

(2)
2
3
x+
1
2
x=42.
答案

(l)

3
28
=
x
15

28x=3×15,

28x÷28=3×15÷28,

x=

45
28

(2)

2
3
x+
1
2
x=42,

7
6
x=42,

7
6
7
6
=42÷
7
6

x=36.

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