试题:
求未知数x.
5074+x=10000
x-3909=6091
x+789=7890
9001-x=679.
解方程 2016-05-21

答案:

我来补答
(1)5074+x=10000,
5074-5074+x=10000-5074,
x=4926;

(2)x-3909=6091,
x-3909+3909=6091+3909,
x=10000;

(3)x+789=7890,
x+789-789=7890-789,
x=7101;

(4)9001-x=679,
9001-x+x=679+x,
679+x=9001,
679-679+x=9001-679,
x=8322.
 
 
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