计算题:(x+y+1)²-(x+y-1)²
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计算题:(x+y+1)²-(x+y-1)²计算题:(x+y+1)²-(x+y-1)²计算题:(x+y+1)²-(x+y-1)²:(x+y+1
计算题:(x+y+1)²-(x+y-1)²
计算题:(x+y+1)²-(x+y-1)²
计算题:(x+y+1)²-(x+y-1)²
:(x+y+1)²-(x+y-1)² 平方差公式
=(x+y+1-x-y+1)(x+y+1+x+y+1)
=2(2x+2y)
=4x+4y
如有不明白,可以追问
如有帮助,记得采纳,谢谢
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