括号里填什么?3x^2-2x+1-()=5x-6(^2=2次方)
问题描述:
括号里填什么?3x^2-2x+1-()=5x-6(^2=2次方)
答
3x^2-2x+1-(3x^2-7 x+7)=5x-6
()=3x^2-2x+1-5 x+6
=3x^2-7 x+7