问题 解答题
求未知数X.
x:12=12:84.5x+3.5x=32+8
12
x
=
3
5
答案

(1)x:12=12:8,

8x=12×12,

8x÷8=144÷8,

x=18;

(2)4.5x+3.5x=32+8,

8x=40,

8x÷8=40÷8,

x=5;

(3)

12
x
=
3
5

3x=12×5,

3x÷3=60÷3,

x=20.

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