1、(1) (-5a²)-a³-(-7a³)=-5a²+6a³=a²(6a-5)(2) 3(a-b)²-7(a-b)+8(a-b)²丛宏氏+6(a-b)=11(a-b)²-(a-b)=(a-b)(11a-11b-1)(3) 3x-2z-[-4x+(z+3y)]=3x-2z-[-4x+z+3y]=3x-2z+4x-z-3y=7x-3z-3y2、15a²-{-4a²+[5a-8a²-(2a²-a)]+9a²渗散-3a} =15a²-{-4a²+[6a-10a²]+9a²-3a} =15a²-{-4a²+6a-10a²绝耐+9a²-3a} =15a²-{-5a²+3a} =10a²-3a =a(10a-3)
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