问题 解答题
求未知数x
5x-24×5=151
5
x
=80%
14:x=3.5:8.
答案

(1)5x-24×5=151,

5x-120=151,

5x-120+120=151+120,

5x=271,

5x÷5=271÷5,

x=54.2;

(2)

5
x
=80%,

5
x
=
4
5

4x=25,

4x÷4=25÷4,

x=

25
4

(3)14:x=3.5:8,

3.5x=14×8,

3.5x÷3.5=14×8÷3.5,

x=32.

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