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解方程:(44-x)(20+5x)=1600.
人气:179 ℃ 时间:2020-03-20 07:51:05
解答
方程可化为880+220x-20x-5x
2
=1600,
5x
2
-200x+720=0,
x
2
-40x+144=0,
(x-4)(x-36)=0,
x
1
=4,x
2
=36.
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