(1)a3•a3+(-2a3)2+(-a2)3
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(1)a3•a3+(-2a3)2+(-a2)3
(2)(x+2)2-(x-1)(x+1)
(3)(x+y+z)(x+y-z)
(4)3(-a+1)(-a-1)-2(a+1)2
(5)(-x2)3-3x2(x4+2x-2)
(6)(2a+b)2-(-2a-b)2.
(2)(x+2)2-(x-1)(x+1)
(3)(x+y+z)(x+y-z)
(4)3(-a+1)(-a-1)-2(a+1)2
(5)(-x2)3-3x2(x4+2x-2)
(6)(2a+b)2-(-2a-b)2.
![(1)a3•a3+(-2a3)2+(-a2)3](/uploads/image/z/86661-45-1.jpg?t=%EF%BC%881%EF%BC%89a3%E2%80%A2a3%2B%EF%BC%88-2a3%EF%BC%892%2B%EF%BC%88-a2%EF%BC%893)
(1)原式=a6+4a6-a6=4a6;
(2)原式=x2+4x+4-(x2-1)=x2+4x+4-x2+1=4x+5;
(3)原式=(x+y)2-z2=x2+2xy+y2-z2;
(4)原式=3(a2-1)-2(a2+2a+1)=3a2-3-2a2-4a-2=a2-4a-5;
(5)原式=-x6-3x6-6x3+6x2=-4x6-6x3+6x2;
(6)原式=4a2+4ab+b2-(4a2+4ab+b2)=0.
(2)原式=x2+4x+4-(x2-1)=x2+4x+4-x2+1=4x+5;
(3)原式=(x+y)2-z2=x2+2xy+y2-z2;
(4)原式=3(a2-1)-2(a2+2a+1)=3a2-3-2a2-4a-2=a2-4a-5;
(5)原式=-x6-3x6-6x3+6x2=-4x6-6x3+6x2;
(6)原式=4a2+4ab+b2-(4a2+4ab+b2)=0.
(1)a3•a3+(-2a3)2+(-a2)3
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