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(x-y)2=91 x2+y2=65 x2+y2=511 (x-y)2=567
2(a﹣1)=2a﹣1 a2b﹣ab2=0 2a3﹣3a3=a3 a2+a2=2a2
2+b=2b (2a2)3=8a5 a6÷a4=a2
2(2a+b)=2a+2b ﹣3(a﹣b)=﹣3a+3b ﹣(a﹣c)=a+c m+(n﹣a)=m﹣n+a
3x+2y= 5xy -y2-y2=0 7x+7x=14x2 7x-7x=0
(a7)2=a9 a7·a2=a14 2a2+3a3=5a5 (ab)3=a3b3
6a+a=7a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
2a+3b=5ab 7ab-3ab=4
2(2a+b)=2a+2b -3(a-b)=-3a+3b -(a-c)=a+c m+(n-a)=m-n+a
2﹣1=﹣2 23=6 22•23=26 (23)2=26
(-2)+(-7) -32 (-3)2 . 3×3-1
(a﹣b)2=a2﹣b2 (﹣a4)3=a7 2a•(﹣3b)=6ab a5÷a4=a(a≠0)
7a+a=7a2 -2a+8b=6ab -4m2n-2m2n=-6m2n 3ab2-5b2a=2ab2
(a7)2=a9 a7•a2=a14 2a2+3a3=5a5 (ab)3=a3b3
2a2+4a2=6a4 (a2)3=a6
5a+3a=8a2 (a-b)2=a2-b2 a3•a7=a10 (a3)2=a7