Question

[X+2][X+3]分之2X-1等于[X+2][X+3]分之A[X+3]减去[X+2][X+3]分之B{X+2}.求2a

Answer 1

-31

因为2X-1=（A-B）X+(3A-2B)

A-B=2

3A-2B=-1

推出A=-5,B=-7

所以2a+3b=-31