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a) ![frac{3}{8}a ^{3}b ^{2}*6ab ^{2}*(-4b) = - frac{3*6*4}{8} a ^{3+1} b ^{2+2+1}=-9a ^{4}b ^{5} frac{3}{8}a ^{3}b ^{2}*6ab ^{2}*(-4b) = - frac{3*6*4}{8} a ^{3+1} b ^{2+2+1}=-9a ^{4}b ^{5}](https://tex.z-dn.net/?f=+frac%7B3%7D%7B8%7Da+%5E%7B3%7Db+%5E%7B2%7D%2A6ab+%5E%7B2%7D%2A%28-4b%29+%3D+-++frac%7B3%2A6%2A4%7D%7B8%7D+a+%5E%7B3%2B1%7D+b+%5E%7B2%2B2%2B1%7D%3D-9a+%5E%7B4%7Db+%5E%7B5%7D+++++++++)
б)![12x ^{4}y ^{5}*(-5xy ^{3} ) ^{2}=12x ^{4}y ^{5}*25 x^{2}y ^{6} =300x ^{4+2}y ^{5+6}=300x ^{6}y ^{11} 12x ^{4}y ^{5}*(-5xy ^{3} ) ^{2}=12x ^{4}y ^{5}*25 x^{2}y ^{6} =300x ^{4+2}y ^{5+6}=300x ^{6}y ^{11}](https://tex.z-dn.net/?f=12x+%5E%7B4%7Dy+%5E%7B5%7D%2A%28-5xy+%5E%7B3%7D+%29+%5E%7B2%7D%3D12x+%5E%7B4%7Dy+%5E%7B5%7D%2A25+x%5E%7B2%7Dy+%5E%7B6%7D+%3D300x+%5E%7B4%2B2%7Dy+%5E%7B5%2B6%7D%3D300x+%5E%7B6%7Dy+%5E%7B11%7D++++++++++)
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