A=2x^2-7x+1 B=4x^2+2-14x 求2A-B
问题描述:
A=2x^2-7x+1 B=4x^2+2-14x 求2A-B
答
2A-B=2(2x^2-7x+1)-(4x^2+2-14x )
=4x^2+2-14x -(4x^2+2-14x )=0
答
2A-B=2(2x^2-7x+1)-(4x^2+2-14x)=4x^2-14x+2-4x^2+14x-2=0
答
2A-B
=2×(2x^2-7x+1 )-(4x^2+2-14x )
=4x^2-14x +2-(4x^2+2-14x )
=4x^2-14x +2-4x^2-2+14x
=0