169(x y)²-121(x-y)²计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/10 23:00:00
x)34ԨPTS64542ԨЅq_[|t"}ِj6`%ц@%چX.L NȤBۨRSHTjBDM4@:6yvPgڀ9y=6-8eO3I =c
169(x y)²-121(x-y)²计算
169(x y)²-121(x-y)²计算
169(x y)²-121(x-y)²计算
169(x +y)²-121(x-y)²
=[13(x+y)+11(x-y)][13(x+y)-11(x-y)]
=(24x+2y)(2x+24y)
=4(12x+y)(x+12y)
第一组里没计算符号?