若2x+3y=2013,则代数式2(3x-2y)-(x-y)+(-x+9y)= ?
问题描述:
若2x+3y=2013,则代数式2(3x-2y)-(x-y)+(-x+9y)= ?
答
2(3x-2y)-(x-y)+(-x+9y)
=6x-4y-x+y-x+9y
=4x+6y
=2(2x+3y)
=2x2013
=4026一个学生由于粗心,在计算41+n时,误将“+”看成“-”,结果得12,则41+n的值应为?