(7.2X68X0.5)÷(1.8X2.3X2.5)简便运算

(7.2X68X0.5)÷(1.8X2.3X2.5)简便运算 若 x2-3x+1=0,求（2x2×x3-5x2×x2+2 x3-8x2 ）÷（x2+1 ）的值 5x2-3+2÷5= 9-2+8-6x2÷5 4x2.5x2+4x2×2+2x2.5x2= 15X2/5X2/5X2/5= 4x2-3y2+2xy-4x2+5x2 x2-5x+1=0则x2+x2/1 （4.8x7.5x8.1)÷(2.4x2.5x2.7)怎么简便计算 (4.8x7.5x8.1)÷（2.5x2.7x2.4)简算 已知X2 /X2-2 =1/1+√3-√5求÷的值 2+5x2+5x2=? 1.5x2.5+2.5x2.5简算 不等式(x2-4x-5)(x2-8) x2-1/x2-5x+6 3x2.5x2 =多少? maxz=2x1+x2,5x2 5(x2-x)=3(x2+x)