>
数学
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(1)计算:
(
(2)解方程:x(2x-5)=4x-10.
人气:393 ℃ 时间:2020-04-03 14:52:35
解答
(1)式=(2
3
)
2
-(
6
)
2
=12-6=6;
(2)方程变形为:x(2x-5)=2(2x-5)
移项得:x(2x-5)-2(2x-5)=0,
提取公因式得:(2x-5)(x-2)=0,
解得:x
1
=2,x
2
=
5
2
.
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