(x 16)X1/4=9/20x

(x 16)X1/4=9/20x 求几道一元二次方程的过程(11)x^2+15x-54=0 x1=-18 x2=3 (12)x^2+11x+18=0 x1=-2 x2=-9 (13)x^2-9x+20=0 x1=4 x2=5 (14)x^2+19x+90=0 x1=-10 x2=-9 (15)x^2-25x+156=0 x1=13 x2=12 (16)x^2-22x+57=0 x1=3 x2=19 (17)x^2-5x-176=0 x1=16 x2=-11 (18)x^2-26x+ 1/2x+4+[x-(1/2x+4)]x1/2+12+16=x y=|x-x1|+|x-x2|+ +|x-xn|(x1 (x-4)x1.6=16(解方程) 写出2008x²-2007x-2009=0的两根积与和,x1×x2_____,x1+x2_______.设方程15x²+20x-9=0的两根为x1,x2,则x1²+x2²=_______ 8+(x-4)x1.7=25 1.x^2-3x-18=0 2.x^2+3x-5=0 3.x^2-4x-7=0 4.3^2-6x-9=0 5.3x^2-6x-9=0不解方程求：x1+x2=...x1乘以x2=...1/x1+1/x2=...x1^2+x2^2=...（x1-x2）^2=. 已知x1,x2是方程x·x+3x+1=0的两个实数根·则x1·x1·x1+8x2+20=? 已知f(x)=x^(4/5),x1 几道简单的一元二次方程(1)x^2-9x+8=0 x1=8 x2=1 (2)x^2+6x-27=0 x1=3 x2=-9 (3)x^2-2x-80=0 x1=-8 x2=10 (4)x^2+10x-200=0 x1=-20 x2=10 (5)x^2-20x+96=0 x1=12 x2=8 (6)x^2+23x+76=0 x1=-19 x2=-4 (7)x^2-25x+154=0 x1=14 x2=11 (8)x^2-12x-108=0 x1=-6 x2 若x1,x2都满足条件|2x-1|+|2x+3|=4,且x1 若X1.X2都满足条件|2X-1|+|2X+3|=4,且X1 已知x1,x2是方程2x^2+3x-4=0的两个根试求：x1+x2,x1.x2,1/x1+1/x2,x1^2+x2^2,(x1+1)(x2+1),x1-x2绝对值,的值. x^2/9+3x^2/16=1解出来x1,x2是多少 2x平方-4x+20=0 x1= _______ x2=_______ f(x)=mx^2+3(m-4)x-9 若函数f(x)有两个零点x1,x2 求d=|x1-x2|最小值 请问用二分法求根 这个程序哪里错误啊#include #includeint main(){double x,x1,x2,a,b,c;for(x1=-10,x2=10;fabs(x1-x2)>=pow(10,-6);){ x=(x1+x2)/2;a=2*x1*x1*x1-4*x1*x1+3*x1-6;b=2*x2*x2*x2-4*x2*x2+3*x2-6;c=2*x*x*x-4*x*x+3*x1-6;if(a*c