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(x+2)(x-2)=x2-2 (2a+b)(-2a+b)=4a2-b2 (2x+3)(2x-3)=2x2-9 (3ab+1)(3ab-1)=9a2b2-1
10X10 B、1/2X1/2 256x256 1X1
x4·x4=x16 (a3)2·a4=a9 (ab2)3÷(-ab)2=-ab4 (a6)2÷(a4)3=1
x4·x4=x16 (a3)2·a4=a9 (ab2)3÷(-ab)2=-ab4 (a6)2÷(a4)3=1
3x-5x=2x 3x2+x=4x3 -7a+4b=-11ab -3ab2-ab2= -4ab
2a+3b=5ab (x+2)2=x2+4 (ab3)2=ab6 (﹣1)0=1
a与b可以是任意实数. a=b. ab=-1. ab=1.
(ab﹣1)(ab+1) (2x﹣1)(﹣1+2x) (﹣2x﹣y)(2x﹣y) (﹣a+5)(﹣a﹣5)
x(x﹣2)+1=(x﹣1)2 a2b+ab3=ab(a+b2) x2+2xy+1=x(x+2y)+1 a2b2﹣1=(ab+1)(ab﹣1)
ab≠1 a≠-2 ab≠1且a≠-2 ab≠1或a≠-2
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
(AB/2)^(1/2) (2/AB)^(1/2) (AB/2) ² (2/AB) ²
x-2y+1=0 x+2y-3=0 2x+y-3=0 2x-y-1=0
y=2x y=-2x+5 y=x2+2x1
(-p2q)3=-p5q3 (12a2b3c)÷(6ab2)=2ab 3m2÷(3m-1)=m-3m2 (x2-4x)x-1=x-4
ab 12 1 ab 2 ab 12 1a b2 ab 12 1a b2 ab 12 1a b2
2a+3b=5ab (﹣1)0=1 (ab3)2=ab6 (x+2)2=x2+4
(-p2q)3=-p5q3 12a2b3c÷6ab2=2ab 3m2÷(3m-1)=m-3m2 (x2-4x)·x-1=x-4
=8 (x+3)2=x2+9 (ab3)2=ab6 (π﹣3.14)0=1