UC知道计算题啦
来源：百度知道 编辑：UC知道 时间：2024/05/31 00:03:30
(2M+3N)(2M-3N)
(-4X+Y)(Y+4X)
(X+Y)(X-Y)+(Y-Z)-(Y+Z)-(X+Z)(X-Z) 本人急用啊
要有过程哈
(-4X+Y)(Y+4X)
(X+Y)(X-Y)+(Y-Z)-(Y+Z)-(X+Z)(X-Z) 本人急用啊
要有过程哈
根据平方差公式
(2M+3N)(2M-3N) =4M^2-9N^2
(-4X+Y)(Y+4X) =Y^2-16X^2
第三题中间也是乘吧
(X+Y)(X-Y)+(Y-Z)(Y+Z)-(X+Z)(X-Z) =X^2-Y^2+Y^2-Z^2-X^2+Z^2=0
=4M^2-9N^2
=Y^2-16X^2
=X^2-Y^2-2Z-X^2+Z^2
=-Y^2-2Z+Z^2
(2M+3N)(2M-3N) =(4M^2-9N^2)
(-4X+Y)(Y+4X) =(Y^2-16X^2)
(X+Y)(X-Y)+(Y-Z)-(Y+Z)-(X+Z)(X-Z)=X^2-Y^2+Y^2-Z^2+Z^2+X^2=0