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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![已知代数式3x^-2x+16的值是90,则代数式3\2x^2-x+18的值为](/uploads/image/z/3850210-10-0.jpg?t=%E5%B7%B2%E7%9F%A5%E4%BB%A3%E6%95%B0%E5%BC%8F3x%5E-2x%2B16%E7%9A%84%E5%80%BC%E6%98%AF90%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8F3%5C2x%5E2-x%2B18%E7%9A%84%E5%80%BC%E4%B8%BA)
已知代数式3x^-2x+16的值是90,则代数式3\2x^2-x+18的值为
已知代数式3x^-2x+16的值是90,则代数式3\2x^2-x+18的值为
已知代数式3x^-2x+16的值是90,则代数式3\2x^2-x+18的值为
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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