x^2+7/4x+5/8

问题描述:

x^2+7/4x+5/8
14X^2+X-3

一:设x^2+7/4x+5/8=0方程两边同时乘以8得:8x^2+14x+5=0因式分解得(2x+1)(4x+5)= 0则:x1= - 1/2 x2= - 5/4所以:x^2+7/4x+5/8 = (2x+1)(4x+5)二:设14X^2+X-3=0 因式分解得:(2x+1)(7x-3)=0则:x1= - ...