A=2x^2-7x+1 B=4x^2+2-14x 求2A-B

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A=2x^2-7x+1B=4x^2+2-14x求2A-BA=2x^2-7x+1B=4x^2+2-14x求2A-BA=2x^2-7x+1B=4x^2+2-14x求2A-B2A-B=2×(2x^2-7x+

A=2x^2-7x+1 B=4x^2+2-14x 求2A-B
A=2x^2-7x+1 B=4x^2+2-14x 求2A-B

A=2x^2-7x+1 B=4x^2+2-14x 求2A-B
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

2A-B=2(2x^2-7x+1)-(4x^2+2-14x)=4x^2-14x+2-4x^2+14x-2=0

2A-B=2(2x^2-7x+1)-(4x^2+2-14x )
=4x^2+2-14x -(4x^2+2-14x )=0