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6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
a+2a2=3a3 (a+b)2=a2+ab+b2 2(a﹣b)=2a﹣2b (2ab)2÷(ab)=2ab(ab≠0)
6a+a=7a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
5ab-3ab=2 2a+3b=5ab
a2+2ab-b2 a2b-2ab+ab=2 4(a+b)2-20(a+b)2+25 -2a2+4ab+2b2
3a+2b=5ab 5y2-3y2=2 2ab-ab=ab 3x2y-5x2y=2x2y
7a+a=7a2 -2a+8b=6ab -4m2n-2m2n=-6m2n 3ab2-5b2a=2ab2
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
3x+2x2=5x3 2a2b﹣a2b=1 ﹣ab﹣ab=0 ﹣x2y+yx2=0
x2y﹣2x2y=﹣x2y 2a+3b=5ab 7ab﹣3ab=4 a3+a2=a5
x2y﹣2x2y=﹣x2y 2a+3b=5ab 7ab﹣3ab=4 a3+a2=a5
[(xy)3]2=(xy)6 (2a2)4=16a8 (m2n)3=m6n3 (ab3)3=a3b6
a2+2ab+b2 a2-b2 a2+b2 a2-2ab+b2