作业帮①先简化,再求值.3a²+b-[2a²b-(2abc-a²b)-4a²c]-abc,其中a=-2,b=-3,c=1②(0.3x²-x²y+xy²-y³)-(-0.5x³-x²y+0.3xy²)写出过程的都+分
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![①先简化,再求值.3a²+b-[2a²b-(2abc-a²b)-4a²c]-abc,其中a=-2,b=-3,c=1②(0.3x²-x²y+xy²-y³)-(-0.5x³-x²y+0.3xy²)写出过程的都+分](/uploads/image/z/1720208-56-8.jpg?t=%E2%91%A0%E5%85%88%E7%AE%80%E5%8C%96%2C%E5%86%8D%E6%B1%82%E5%80%BC.3a%26sup2%3B%2Bb-%5B2a%26sup2%3Bb-%282abc-a%26sup2%3Bb%29-4a%26sup2%3Bc%5D-abc%2C%E5%85%B6%E4%B8%ADa%3D-2%2Cb%3D-3%2Cc%3D1%E2%91%A1%280.3x%26sup2%3B-x%26sup2%3By%2Bxy%26sup2%3B-y%26sup3%3B%29-%28-0.5x%26sup3%3B-x%26sup2%3By%2B0.3xy%26sup2%3B%29%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B%E7%9A%84%E9%83%BD%2B%E5%88%86)
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①先简化,再求值.3a²+b-[2a²b-(2abc-a²b)-4a²c]-abc,其中a=-2,b=-3,c=1②(0.3x²-x²y+xy²-y³)-(-0.5x³-x²y+0.3xy²)写出过程的都+分
①先简化,再求值.
3a²+b-[2a²b-(2abc-a²b)-4a²c]-abc,其中a=-2,b=-3,c=1
②(0.3x²-x²y+xy²-y³)-(-0.5x³-x²y+0.3xy²)
写出过程的都+分
①先简化,再求值.3a²+b-[2a²b-(2abc-a²b)-4a²c]-abc,其中a=-2,b=-3,c=1②(0.3x²-x²y+xy²-y³)-(-0.5x³-x²y+0.3xy²)写出过程的都+分
①先简化,再求值.
3a²+b-[2a²b-(2abc-a²b)-4a²c]-abc,其中a=-2,b=-3,c=1
3a²+b-[2a²b-(2abc-a²b)-4a²c]-abc
=3a²+b-[2a²b-2abc+a²b-4a²c]-abc
=3a²+b-2a²b+2abc-a²b+4a²c-abc
=3a²+b-3a²b+abc+4a²c
a=-2,b=-3,c=1
原式=3*4-3-3*4*（-3）+（-2）（-3）*1+4*4*1
=12-3+36+6+16=67
②(0.3x²-x²y+xy²-y³)-(-0.5x³-x²y+0.3xy²)
=0.3x²-x²y+xy²-y³+0.5x³+x²y-0.3xy²
=0.5x³+0.3x²+0.7xy²-y³
1=67
2=0.7xy平方+0.8X立方-y立方