2x-y)^2-(x-y)^2 =(2x-y+x-y)(2x-y-x+y) =3x(3x-2y)最后一步怎么理解
1个回答
你好像算错了,这是平方差公式
最后应该是 x(3x-2y)
相关问题
(x-y)(x+y)=x^2-y^2 (x-y)(x^2+xy+y^2)=x^3-y^3 (x-y
计算:[(x+y/x-y)^2·(2y-2x/3x+3y)]-[(x^2/x^2-y^2)/(x/y)]
3x(x-2y)+(x+2y)(2x-y)-3y(y-2x)
(3x-2y)²-(2x-y)(2x-3y)+(2x+y)(2x-y)
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x
计算(-x-2y)∧2-(x-y+3)(x+y-3)-(2y-x)(x+3y),
(1)(x-2y)^6/(2y-x)^3 (2)(-x-y)^6/(x+y)^3 (3)(x-2y)^3*(x-2y)^
3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
一次函数1,作图 ①y=-3x+3 ②y=2x+2 ③y=2x-2 ④y=-3x-3 ⑤y=-x ⑥y=-x.