Question

已知A=2x,B是多项式,亮亮在计算B+A时,把B+A误写成了B÷A,结果得x^2+1/2 x-1,试求B+A

Answer 1

B/A=x^2+1/2 x-1

A=2X

B=(x^2+1/2 x-1)*2X

B=2X^3+X^2-2X

B+A=2X^3+X^2-2X+2X=X^2(2X+1)