已知代数式3x^-2x+16的值是90,则代数式3\2x^2-x+18的值为

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3/2x^2-x+18
=(3x²-2x+16)/2+10
=90/2+10
=55

3x^-2x+16=90
则：3x^-2x=74
3\2x^2-x+18
=1/2(3x^-2x)+18
=1/2 X 74+18
=37+18
=55

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