计算 (1/3x-1/2y)(1/2y-1/3x)
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计算 (1/3x-1/2y)(1/2y-1/3x)
计算 (1/3x-1/2y)(1/2y-1/3x)
计算 (1/3x-1/2y)(1/2y-1/3x)
=-(1/3x-1/2y)²
=-(1/9x²-1/3xy+1/4y²)
=-1/9x²+1/3xy-1/4y²
是因式分解吗?
(1/3x-1/2y)(1/2y-1/3x)
= -(1/2y-1/3x)(1/2y-1/3x)
运用完全平方公式
=-【(1/2y)²-1/3xy+(1/3x)】²
= -1/4y²+1/3xy-1/9x²
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