169(x y)²-121(x-y)²计算
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169(xy)²-121(x-y)²计算169(xy)²-121(x-y)²计算169(xy)²-121(x-y)²计算169(x+y)&#
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？