计算[(x+y)²—(x—y)²]÷4xy(过程要)
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计算[(x+y)²—(x—y)²]÷4xy(过程要)计算[(x+y)²—(x—y)²]÷4xy(过程要)计算[(x+y)²—(x—y)²]÷
计算[(x+y)²—(x—y)²]÷4xy(过程要)
计算[(x+y)²—(x—y)²]÷4xy(过程要)
计算[(x+y)²—(x—y)²]÷4xy(过程要)
=[x²+2xy+y²-(x²-2xy+y²)]÷4xy
=4xy÷4xy
=1