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5a+2a=7a2 5a﹣2b=3ab 5a﹣2a=3 ﹣ab3+2ab3=ab3
6a-5a=1 5x-6x=11x m2-m=m x3+6x3=7x3
﹣7﹣8=﹣1 5+(﹣2)=3 ﹣6+0=0 4﹣13=9
3a·2a=5a 3a·2a=5a2 3a·2a=6a 3a·2a=6a2
3a﹣a=2 ﹣42=﹣16 3a+b=3ab ﹣5﹣2=﹣3
3a+2a=5a2 3a﹣a=3 2a3+3a2=5a5 ﹣a2b+2a2b=a2b
3a+b=3ab 3a﹣a=2 2a3+3a2=5a5 ﹣a2b+2a2b=a2b
2-5= -3 (-2)+(-5)=-7 (-3)2=-9 (-2)-(-1)=-1
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
+= (ab2)2=ab4 2a+3a=6a a•a3=a4
﹣5+4=﹣9 ﹣8﹣8=0 23=6 ﹣42=﹣16
2+a=2a 2a﹣3a=﹣1 (﹣a)2•a3=a5 8ab÷4ab=2ab
a2×a3=a6 ﹣= 8﹣1=﹣8 (a+b)2=a2+b2
2a+2b=4ab 3x2﹣x2=2 5mn﹣5nm=0 a﹣a=a2
(﹣3)﹣(﹣5)=﹣8 (﹣3)+(﹣5)=+8 (﹣3)3=﹣9 ﹣32=﹣9
a2•a3=a5 a2+a3=a5 (a3)2=a5 a3÷a2=1
a+2a=3a2 a2+a3=a5 a3÷a=3 (-a)3=a3
﹣3﹣2=﹣5 ﹣|2|=2 1÷(﹣3)= ﹣2×3=6
-3-3=0 30+32=9 3÷|-3|=-1 3×(-3)-1=-1
3a-a=2 -42=-16 3a+b=3ab -5-2=-3