问题 解答题
求未知数x的值.
(1)5x+0.75×4=6.5(2)x:
5
14
=21:
5
8
答案

(1)5x+0.75×4=6.5,

5x+3=6.5,

5x+3-3=6.5-3,

5x=3.5,

5x÷5=3.5÷5,

x=0.7;

(2)x:

5
14
=21:
5
8

5
8
x=
5
14
×21

5
8
x=
15
2

5
8
x×8=
15
2
×8

5x=60,

5x÷5=60÷5,

x=12.

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