16-8(x-y)+(x+y)的平方
=(x+y)²-8(x-y)+16
=(x+y)²-2*(x-y)*4+4²
=(x+y-4)²16-8（x-y）+(x-y)²=4²-2×4(x-y)+(x-y)²=(4-x+y)²=(x-y-4)²對(duì)，你題目寫錯(cuò)了，后面括號(hào)內(nèi)寫成+了，對(duì)應(yīng)更正為：16-8(x-y)+(x-y)的平方=(x-y)²-8(x-y)+16=(x-y)²-2*(x-y)*4+4²=(x-y-4)² 兩個(gè)解法都可以16-8（x-y）+(x-y)²=4²-2×4(x-y)+(x-y)²=(4-x+y)²=(x-y-4)²這個(gè)計(jì)算是正確的