5x^2+6xy-8y^2因式分解.详步必赏
问题描述:
5x^2+6xy-8y^2因式分解.详步必赏
答
5x^2+6xy-8y^2
=5x^2+10xy-4xy-8y^2
=5x(x+2y)-4y(x+2y)
=(x+2y)(5x-4y)
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