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5a+2a=7a2 5a﹣2b=3ab 5a﹣2a=3 ﹣ab3+2ab3=ab3
x2y-2xy2=-x2y 2a+3b=5ab -3ab-3ab=-6ab a3+a2=a5
a+2a2=3a3 (a+b)2=a2+ab+b2 2(a﹣b)=2a﹣2b (2ab)2÷(ab)=2ab(ab≠0)
3x-5x=2x 3x2+x=4x3 -7a+4b=-11ab -3ab2-ab2= -4ab
2PA+2PB PA+AB+PB PA+PB-AB 2PA+PB-AB
x2y﹣2xy2=﹣x2y 2a+3b=5ab a3+a2=a5 ﹣3ab﹣3ab=﹣6ab
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
x2y﹣2xy2=﹣x2y 2a+3b=5ab a3+a2=a5 ﹣3ab﹣3ab=﹣6ab
2+a=2a 2a﹣3a=﹣1 (﹣a)2•a3=a5 8ab÷4ab=2ab
(AB/2)^(1/2) (2/AB)^(1/2) (AB/2) ² (2/AB) ²