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(ab)2=ab2 5a2﹣3a2=2 a(b+2)=ab+2 5a3•3a2=15a5
3a+2b=5ab 13x﹣18x=﹣5 5+a=5a 6ab﹣ab=5ab
5a+2a=7a2 5a﹣2b=3ab 5a﹣2a=3 ﹣ab3+2ab3=ab3
x2y-2xy2=-x2y 2a+3b=5ab -3ab-3ab=-6ab a3+a2=a5
3x-5x=2x 3x2+x=4x3 -7a+4b=-11ab -3ab2-ab2= -4ab
2a+3b=5ab 7ab-3ab=4
2a+3b=5ab 12x﹣20x=﹣8 6ab﹣ab=5ab 5+a=5a
2b的值为( ) A.3ab 6a 6ab 5ab
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
2ab a2b a2b2 ab2