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2+ +1 3 5
8≤AB≤10 8<AB≤10 4≤AB≤5 4<AB≤5
5a+2a=7a2 5a﹣2b=3ab 5a﹣2a=3 ﹣ab3+2ab3=ab3
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
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
3<AB<5 2<AB<8 3<AB<8 2<AB<5
8≤AB≤10 8<AB≤10 4≤AB≤5 4<AB≤5
5b+3ab ﹣5b+3ab 5b﹣3ab ﹣5b﹣3ab
2+a=2a 2a﹣3a=﹣1 (﹣a)2•a3=a5 8ab÷4ab=2ab
2a+3b=5ab 12x﹣20x=﹣8 6ab﹣ab=5ab 5+a=5a