(2X的平方+3ax-y)-2(bx的三次方-3x+2y-1)
=-2b^3x^3+4x^2+(3a+6)x-5y+2
2X的平方+3ax-y)-2(bx的三次方-3x+2y-1)的值与字母X的取值无关
故b=0,3a+6=0则a=-2
(a-b)-(a+b)=0
(注:若与某个未知数无关,那么化简后含有它的系数全为0)
(2X的平方+3ax-y)-2(bx的三次方-3x+2y-1)
=-2b^3x^3+4x^2+(3a+6)x-5y+2
2X的平方+3ax-y)-2(bx的三次方-3x+2y-1)的值与字母X的取值无关
故b=0,3a+6=0则a=-2
(a-b)-(a+b)=0
(注:若与某个未知数无关,那么化简后含有它的系数全为0)