已知代数式3x^-2x+16的值是90,则代数式3\2x^2-x+18的值为
问题描述:
已知代数式3x^-2x+16的值是90,则代数式3\2x^2-x+18的值为
答
3/2x^2-x+18
=(3x²-2x+16)/2+10
=90/2+10
=55