Question

3m²-4m+6的值为9求m²-3/4m+6的值

Answer 1

问：3m²-4m+6的值为9求m²-3/4m+6的值

答：3m²-4m+6＝9，m²-4m/3+2＝3，(m-2/3)²-(2/3)²+2＝3，(m-2/3)²＝(2/3)²+3-2＝13/9，m-2/3＝±√13/3，m＝2/3±√13/33m²-4m+6＝9，3m²＝4m+9-6，3m²＝4m+3，m²＝4m/3+1，m²-3m/4+6＝4m/3-3m/4+6＝(4/3-3/4)m+6＝7m/12+6＝7(2/3±√13/3)/12+6＝14/36±7√13/36+6＝7/18+6±7√13/36＝115/18±7√13/36