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2a2+3a2=5a2 2a2+3a2=6a2 4xy﹣3xy=1 2x3+3x3=5x6
3a+2a=5a2 (2a)3=6a3 (x+1)2=x2+1 x2-4=(x+2)(x-2)
3a·2a=5a 3a·2a=5a2 3a·2a=6a 3a·2a=6a2
3a+2a=5a2 (2a)3=6a3 (x+1)2=x2+1 x2-4=(x+2)(x-2) 答案:
3a•2a=5a 3a•2a=5a2 3a•2a=6a 3a•2a=6a2
6a﹣5a=1 (a2)3=a5 3a2+2a3=5a5 2a•3a2=6a3
只与a有关 只与b有关 与字母a、b都有关 与字母a、b都无关
3a2﹣6a2=﹣3 (﹣2a)•(﹣a)=2a2 10a10÷2a2=5a5 ﹣(a3)2=a6
3a•2a=5a 3a•2a=5a2 3a•2a=6a 3a•2a=6a2