数学,第四题 10
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(1)(4a3b-10b3)+(-3a2b2+10b3)=4a3b-10b3-3a2b2+10b3=4a3b-3a2b2=a2 b(4a-3b)
(2)(4x2y-5xy2)-(3x2y-4xy2)=4x2y-5xy2-3x2y+4xy2=x2y-xy2
(3)5a2-【a2+(5a2-2a)-2(a2-3a)】=5a2-(a2+5a2-2a-2a2+6a)
=5a2-(4a2+4a)=5a2-4a2-4a=a2-4a
(4)15+3(1-a)-(1-a-a2)+(1-a+a2-a3)=15+3-3a-1+a+a2+1-a+a2-a3
=18-3a+2a2-a3
(5)(4a2b-3ab)+(-5a2b+2ab)=4a2b-3ab-5a2b+2ab=-a2b-ab
(6)(6m2-4m-3)+(2m2-4m+1)=6m2-4m-3+2m2-4m+1=8m2-8m-2
(7)(5a2+2a-1)-4(3-8a+2a2)=5a2+2a-1-12+32a-8a2=-3a2+34a-13
(8)3X2-【5x-(1/2x-3)+2x2】=3X2-(5x-1/2x+3+2x2)
=3X2-[(9/2)x+3+2x2]=3X2-(9/2)x-3-2x2=X2-(9/2)x-3
(2)(4x2y-5xy2)-(3x2y-4xy2)=4x2y-5xy2-3x2y+4xy2=x2y-xy2
(3)5a2-【a2+(5a2-2a)-2(a2-3a)】=5a2-(a2+5a2-2a-2a2+6a)
=5a2-(4a2+4a)=5a2-4a2-4a=a2-4a
(4)15+3(1-a)-(1-a-a2)+(1-a+a2-a3)=15+3-3a-1+a+a2+1-a+a2-a3
=18-3a+2a2-a3
(5)(4a2b-3ab)+(-5a2b+2ab)=4a2b-3ab-5a2b+2ab=-a2b-ab
(6)(6m2-4m-3)+(2m2-4m+1)=6m2-4m-3+2m2-4m+1=8m2-8m-2
(7)(5a2+2a-1)-4(3-8a+2a2)=5a2+2a-1-12+32a-8a2=-3a2+34a-13
(8)3X2-【5x-(1/2x-3)+2x2】=3X2-(5x-1/2x+3+2x2)
=3X2-[(9/2)x+3+2x2]=3X2-(9/2)x-3-2x2=X2-(9/2)x-3
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