作业帮 > 数学 > 作业

2(x+y)(x-y)-(x+y)²-(x-y)² 等于多少

来源：学生作业帮 编辑：百度作业网作业帮 分类：数学作业 时间：2024/07/02 15:30:45
2(x+y)(x-y)-(x+y)²-(x-y)² 等于多少
2(x+y)(x-y)-(x+y)²-(x-y)² 等于多少
2(x+y)(x-y)-(x+y)²-(x-y)²
=-[(x+y)²-2(x+y)(x-y)+(x-y)²]
=-[(x+y)-(x-y)]²
=-(2y)²
=-4y²
运用完全平方公式,要比各项展开再消去简便许多.
(x-y)³(x-y)²(y-x)等于多少 (x-y)的四次方(x-y)-2(x-y)²(y-x）³等于? （x-y）²×(y-x)³ 等于多少 解法. （x-y）²（y-x）³等于多少. (x+y)²-(x+y)³等于多少啊 (x+2y)²等于多少? 1/2X-1/X+Y*(X+Y/2X-X-Y)等于多少, (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) （x-2y)³÷（2y-x）²等于多少? （-x）²×（-x）³等于多少? x/4+2等于x,x=多少.y/5等于y-3,Y=多少 (3x-y)(x+2y)最后等于多少!