9(x-3)²=25 x²+3x-1=0 (2x-3)²-2(3-2x)=8 x(x-1)=2
问题描述:
9(x-3)²=25 x²+3x-1=0 (2x-3)²-2(3-2x)=8 x(x-1)=2
答
9(x-3)²=25(x-3)²=25/9x-3=5/3或x-3=-5/3∴x=3+5/3或x=3-5/3即:x=14/3或x=4/3x²+3x-1=0 x²+3x=1x²+3x+(3/2)²=1+9/4(x+3/2)²=13/4x+3/2=(√13)/2或x+3/2=-(√13)/2即:x=(-3+...