作业帮数学先化简再求值!
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 06:51:50
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数学先化简再求值!
数学先化简再求值!
数学先化简再求值!
原式=y(x+2y)(x-2y)/(x+2y)²*(4xy+x²-2xy)/(x-2y)
=y(x-2y)/(x+2y)*(x²+2xy)/(x-2y)
=y(x-2y)/(x+2y)*x(x+2y)/(x-2y)
=xy
=(√2-1)(√2+1)
=2-1
=1