问题
解答题
求未知数X的值.
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答案
(1)
x﹢2 3
=42,1 2
x﹢2 3
-1 2
=42-1 2
,1 2
x÷2 3
=412 3
÷1 2
,2 3
x=62
;1 4
(2)
=3:8,X 24
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.