折射率与波长的关系

1. (x-1)(x-3x+2）＜0 2. （2x-7x-4x）＜0 求解一元二次不等式的解集,急用.要步骤 ,急用 .高一水平数学. 解一元二次不等式-x^2-3x+10≥0的解解一元二次不等式-x^2-3x+10≥0的解集 7x+3x=1,2x-3x=8;的解? -x^2+7x-12 求极限4x2+3x-5/x2-7x-12 3x＋5=7x－3 7x-4=3x+5怎么解 －3x－7x＝5 7x—5=（3x—4）*2 已知3x^2-7x+2已知(3x^2-7x+2)/((x-1)(x+1))=3+A/(x-1)+B/(x+1),其中A,B为常数,求4A-2B的值 (4+3x^3-7x^2)÷(2+3x) 2.3x+7.7x-5=2.8这题怎么解方程 [7x-39]:[3x+39]=3:2 怎么解 我要解 一步步解 3X的平方-7X 4=2怎么解 3x∧2－7x＋4＝0 怎么平方? 求3x的平方-6x+5与4x的平方-7x-6的和 计算(6x^2-4x)/(3x-2) 分解因式:3x^4+7x^3-6x^2-3x+2 1.如果6X=42,那么1.3X+2.7X的值是多少? 如果6x=42,那么1.3x+2.7x的值是多少? 先化简再求值3x³-[x³+（6x²-7x）]-2（x³-3x²-4x),其中x=-1 化简：3x²-【7x-（4x-3）-3x²】 若方程3x-4=4x+3和方程2(x+1)—m=-2(m-2)的解相同,则m等于多少? 用配方法解方程3x平方-x-6=0 用配方法解方程3x的平方+x-9=0 解方程:3x的平方+x+2=0 用配方法 用配方法解方程 (1)1/3x-x-4=0 (2)6x^2-x-1=0 (3)x^2+7/4x+1/2=0 利用换元法解分式方程2x-1/x + x/2x-1=2 用换元法解分式方程(x-2/x)^2-2x+4/x=-1 用换元法解分式方程(2x-1)+x/(2x-1)=2 用换元法解分式方程x^2-2x+7/x^2-2x=8jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj 用换元法解分式方程x-1/x-3x/x-1+1=0时,如果设x-1/x=y,将原方程化为关于y的整式方程,那么这个整式方程为