已知A=x*2-2xy+y*2,B=x*2+2xy+y*2-3,化簡:2A-[B-(B-A)+2A+B
已知A=x*2-2xy+y*2,B=x*2+2xy+y*2-3,化簡:2A-[B-(B-A)+2A+B
數(shù)學(xué)人氣:755 ℃時間:2020-06-20 10:35:33
優(yōu)質(zhì)解答
2A-[B-(B-A)]+2A+B =2A-A+2A+B=3A+B=3(x*2-2xy+y*2)+x*2+2xy+y*2-3=3x*2-6xy+3y*2+x*2+2xy+y*2-3=4x*2-4xy+4y*2-3
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