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-6ab2c -ab2 -6ab2 -6a3b2c
3a2﹣a2=3 (a2)3=a5 a3•a6=a9 (2a2)2=4a2
x2y﹣2xy2=﹣x2y 2a+3b=5ab a3+a2=a5 ﹣3ab﹣3ab=﹣6ab
x2y﹣2xy2=﹣x2y 2a+3b=5ab a3+a2=a5 ﹣3ab﹣3ab=﹣6ab
(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
(-p2q)3=-p5q3 (12a2b3c)÷(6ab2)=2ab 3m2÷(3m-1)=m-3m2 (x2-4x)x-1=x-4
(-p2q)3=-p5q3 12a2b3c÷6ab2=2ab 3m2÷(3m-1)=m-3m2 (x2-4x)·x-1=x-4