3x^2-5x-7+6x^2-5x-2
=3x^2+6x^2-5x-5x-2-7
=9x^2-10x-9再问下,差等于呢?3x^2-5x-7-(6x^2-5x-2)=3x^2-5x-7-6x^2+5x+2=3x^2-6x^2-5x+5x+2-7=-3x^2-5
多项式3x^2-5x-7与6x^2-5x-2的和等于
多项式3x^2-5x-7与6x^2-5x-2的和等于
数学人气:560 ℃时间:2020-04-13 06:09:29
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