Question

2x-1/3x+2=a/3x+2+b 求a=?b=?

已知A=2x的2次方-3x+1,B=-x+2x-,求A+2B、A-B的值
B=-x的2次方+2x-3

Answer 1

您好!
A+2B=2x^2-3x+1+2(-x^2+2x-3)
=x-5
A-B=2x^2-3x+1-(-x^2+2x-3)
=3x^2-5x+4