2a²+2a-3
=2（a²+a+3)-3-6
=2×7-9
=5-P的平方减去-P的平方减去-P的平方减去等于-3p的平方吗、1、（-p)²-(-p)²-(-p)²=p²-p²-p²=-p²2、-p²-(-p²)-(-p²)=-p²+p²+p²=p²不知是哪个
代数式a²+a+3的值为7,则代数式2a²+2a-3=多少
代数式a²+a+3的值为7,则代数式2a²+2a-3=多少
数学人气：627 ℃时间：2019-09-27 11:53:50
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