(x-y)(x-2y)-1/2(2x-3y)(x+2y)化简 急求一定要化简 10
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(x-y)(x-2y)-1/2(2x-3y)(x+2y)
=(x2+2y2-3xy)-1/2(2x2-6y2+xy)
=x2+2y2-3xy-x2+3y2-(1/2)xy
=5y2-(7/2)xy
=(x2+2y2-3xy)-1/2(2x2-6y2+xy)
=x2+2y2-3xy-x2+3y2-(1/2)xy
=5y2-(7/2)xy
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