计算:(x-3y)(x+2y)
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计算:(x-3y)(x+2y)
计算:(x-3y)(x+2y)
计算:(x-3y)(x+2y)
原式=x²+2xy-3xy-6y²
=x²-xy-6y²
x*x - x*y -6*y*y
:(x-3y)(x+2y)=X^2-XY-6Y^2
=x²+5xy+6y²
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