问题
解答题
求未知数X的值. (1)5x-3.7=8.5 (2)
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答案
(1)5x-3.7=8.5,
5x-3.7+3.7=8.5+3.7,
5x=12.2,
5x÷5=12.2÷5,
x=2.44,
(2)
=x 21
,0.5 7
7x=21×0.5,
7x=10.5,
7x÷7=10.5÷7,
x=1.5.
求未知数X的值. (1)5x-3.7=8.5 (2)
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(1)5x-3.7=8.5,
5x-3.7+3.7=8.5+3.7,
5x=12.2,
5x÷5=12.2÷5,
x=2.44,
(2)
=x 21
,0.5 7
7x=21×0.5,
7x=10.5,
7x÷7=10.5÷7,
x=1.5.