回答(2件)
(x-y)²/2-(2y-3x)(x+3y)/3 -(3x+4y)(4x-3y)/8 =12(x-y)²/24-8(2y-3x)(x+3y)/24 -3(3x+4y)(4x-3y)/24 =(12(x-y)²-8(2y-3x)(x+3y) -3(3x+4y)(4x-3y))/24 =(12(x-y)²+8(3x-2y)(x+3y) -3(3x+4y)(4x-3y))/24 =(12(x²-2xy+y²)+8(3x²+7xy-6y²) -3(12x²+7xy-12y²))/24 =(12x²-24xy+12y²+24x²+56xy -48y²-36x²-21xy+36y²)/24 =(36x²+32xy-36y² -36x²-21xy+36y²)/24 =(+32xy-21xy)/24 =11xy/24 答え (11/24)xy
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