> 数学 >
完全平方公式(过程)
(1)(y+2)(y-2)-(y-1)(y+5) (2)(2x+y-z+10)(2x-y+z+100
(3)(a+b)²(a-b)²-(a²+b²)(a-b)
人气:245 ℃ 时间:2020-04-08 03:09:44
解答
(1)(y+2)(y-2)-(y-1)(y+5) =y²-4-y²-4y+5=-4y+1(2)(2x+y-z+10)(2x-y+z+100)=(2x+100)²-(y-z)²=4x²+400x+10000-y²+2yz-z²(3)(a+b)²(a-b)²-(a...
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版