计算(X+2Y-1)(X+2Y+1)
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计算(X+2Y-1)(X+2Y+1)计算(X+2Y-1)(X+2Y+1)计算(X+2Y-1)(X+2Y+1)原式=[(X+2Y)-1][(X+2Y)+1]=(X+2Y)²-1²=X
计算(X+2Y-1)(X+2Y+1)
计算(X+2Y-1)(X+2Y+1)
计算(X+2Y-1)(X+2Y+1)
原式=[(X+2Y)-1][(X+2Y)+1]
=(X+2Y)²-1²
=X²+4XY+4Y²-1
(X+2Y-1)(X+2Y+1)
=(x+2y)²-1
=x²+4xy+4y²-1
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