Question

4（x+y）²-4（x²-y²）+（x-y）²分解;因式

Answer 1

【[2（x+y）]-(x-y)】²
刚才想错了
LS是分解因事吗？明明是化简

Answer 2

解：
4(x+y)²-4(x²-y²)+(x-y)²
=[2(x+y)]²-4(x+y)(x-y)+(x-y)²
=[2(x+y)-(x-y)]²
=(2x+2y-x+y)²
=(x+3y)²
加油！