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X1 X2
(Xl,X2) (Xl,X2,X3,X4)
x6÷x3=x2B (x-1)2=x2-1 x4+x4=x8 (x-1)2=x2-2x+1
X1 X2 (X1,X2) (X1,X2,X3,X4)
a+2a2=3a3 (a+b)2=a2+ab+b2 2(a﹣b)=2a﹣2b (2ab)2÷(ab)=2ab(ab≠0)
X1 X2 (X1,X2) (X1,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
2+a=2a 2a﹣3a=﹣1 (﹣a)2•a3=a5 8ab÷4ab=2ab
x2·x3=x6 (x2)3=x8 x2+x3=x5 x6÷x3=x3
S(AB)<S(A2B) S(AB)>S(A2B) S(AB)=S(A2B) 不能确定
(-p2q)3=-p5q3 (12a2b3c)÷(6ab2)=2ab 3m2÷(3m-1)=m-3m2 (x2-4x)x-1=x-4
(-p2q)3=-p5q3 12a2b3c÷6ab2=2ab 3m2÷(3m-1)=m-3m2 (x2-4x)·x-1=x-4
X1 X2 (Xl,X2) (Xl,X2,X3,X4)