(4r^2+7r)+(-r^2+3r-1)计算

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(4r^2+7r)+(-r^2+3r-1)计算(4r^2+7r)+(-r^2+3r-1)计算(4r^2+7r)+(-r^2+3r-1)计算(4r^2+7r)+(-r^2+3r-1)=4r^2+7r-r

(4r^2+7r)+(-r^2+3r-1)计算
(4r^2+7r)+(-r^2+3r-1)计算

(4r^2+7r)+(-r^2+3r-1)计算
(4r^2+7r)+(-r^2+3r-1)
=4r^2+7r-r^2+3r-1
=3r^2+10r-1