[(x+y)^3 ]^4乘[-(x+y)^2]^3=?___________ ___________ ___________ ___________ ___________

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[(x+y)^3 ]^4乘[-(x+y)^2]^3=?___________ ___________ ___________ ___________ ___________
[(x+y)^3 ]^4乘[-(x+y)^2]^3=?___________ ___________ ___________ ___________ ___________

[(x+y)^3 ]^4乘[-(x+y)^2]^3=?___________ ___________ ___________ ___________ ___________
原式 = (x+y)^12 * [-(x+y)^6] = - (x+y)^18

-(x+y)^12*(x+y)^6=-(x+y)^18