1.解方程：x-7/x-19+x-15/x-17=x-13/x-15+x-9/x-11.2.一直x、y为实数,且y=x+1/x,x^4+x^3-4x^3+x+1=0,求y的值

解方程15-x=7+x 0.3x+7x-15%x=21.25 解方程 19X-X=54 解方程 7x-x=0.48 解方程7x+x=0.48 1.解方程：x-7/x-19+x-15/x-17=x-13/x-15+x-9/x-11.2.一直x、y为实数,且y=x+1/x,x^4+x^3-4x^3+x+1=0,求y的值 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程 (x-2)(x+1)(x+4)(x+7)=19 解方程(x-2)(x+1)(x+4)(x+7)=19解方程 (x-2)(x-3)+2(x-6)(x-5)=3(x²-7x+15)(解方程) 解方程：(x-2)(x-3)+2(x+6)(x-5)=3(x的平方-7x+15) matlab解数值分析题p=(x-1)*(x-2)*(x-3)*(x-4)*(x-5)*(x-6)*(x-7)*(x-8)*(x-9)*(x-10)*(x-11)*(x-12)*(x-13)*(x-14)*(x-15)*(x-16)*(x-17)*(x-18)*(x-19)*(x-20)解为1,2,3……,20取多个非常小的数用软件工具求解方程p（x）+n*x^19=0,并 MATLAb编程解方程clear;clcsyms xfor n=1:6X2=solve('(x-1)*(x-2)*(x-3)*(x-4)*(x-5)*(x-6)*(x-7)*(x-8)*(x-9)*(x-10)*(x-11)*(x-12)*(x-13)*(x-14)*(x-15)*(x-16)*(x-17)*(x-18)*(x-19)*(x-20)+1e-n*x^19=0',x);double(X2)end与直接代入n=1,2,...6算出来 解方程[(19x-x^2)/(x+1)][x+(19-x)/(x+1)]=84. 解方程：(19x-x^2)/(x+1)*(x+(19-x)/(x+1))=84 解方程：x(3x-4)+2x(x+7)=5x(x-7)+90 解方程(x-3/x)-(3-x/x+1)=5x-15/2x+2 解方程(x-2)(x+1)(x+4)(x+7)=19 解方程:(x^2 + 7x + 5)^2 - 3x^2 - 21x=19 解方程：5x(x+7)(x+4)=5x(x的平方+11x) 5x(x+7)(x+4)=5x(x^2+11X)解方程,