解方程(2X+1)^2=(x-1)^2 X^2+4X-1=0 3X^2-5X+1=0 √18除√3/4*√4/3(2X+1)^2=(x-1)^2,X^2+4X-1=0,3X^2-5X+1=0 √18除√3/4*√4/3

问题描述:

解方程(2X+1)^2=(x-1)^2 X^2+4X-1=0 3X^2-5X+1=0 √18除√3/4*√4/3
(2X+1)^2=(x-1)^2,X^2+4X-1=0,3X^2-5X+1=0 √18除√3/4*√4/3

(2X+1)^2=(x-1)^24X²+4X+1=X²-2X+13X²+6X=03X(X+2)=0∴ 3X=0或(X+2)=0∴X1=0,X2=-2X^2+4X-1=0∵a=1,b=4 .c=-1Δ=4²-4×1×(-1)=20>0∴X1=(-4+2√5)/2=√5-2,X2=(-4-2√5)/2=-...