题目

问关于matlab解方程的问题~
x是方程((0.5*X1+2*X2+3.5*X3+3*X4+5*X5+4.5*X6+6.5*X7+6*X8+7.5*X9+8*X10+0.5*X11+1.5*X12)-X14)/0.21*1.2*0.79+X15)*(27.32*(x-298)+6.226/2000*(x^2-298^2)-0.9502/(3*10^6)*(x^3-298^3))+(X2+2*X3+2*X4+3*X5+3*X6+4*X7+4*X8+4*X9+4*X10+X11+X13)*(26.75*(x-298)+42.258/2000*(x^2-298^2)-14.25/(3*10^6)*(x^3-298^3))+(X1+2*X2+3*X3+2*X4+4*X5+3*X6+5*X7+4*X8+5*X9+6*X10+X12 )*(29.16*(x-298)+14.49/2000*( x^2-298^2)-2.022/(3*10^6)*(x^3-298^3))+((0.5*X1+2*X2+3.5*X3+3*X4+5*X5+4.5*X6+6.5*X7+6*X8+7.5*X9+8*X10+0.5*X11+1.5*X12)-X14)*0.2*(28.17*(x-298)+6.297/2000*(x^2-298^2)-0.7494/(3*10^6)*(x^3-298^3))+X12*(25.76*(x-298)+57.91/2000*(x^2-298^2)-38.09/(3*10^6)*(x^3-298^3))+15*((0.5*X1+2*X2+3.5*X3+3*X4+5*X5+4.5*X6+6.5*X7+6*X8+7.5*X9+8*X10+0.5*X11+1.5*X12-X14)/0.21*0.79*y+X15)*((0.5*X1+2*X2+3.5*X3+3*X4+5*X5+4.5*X6+6.5*X7+6*X8+7.5*X9+8*X10+0.5*X11+1.5*X12-X14)*(y-1))^0.5*exp(-1542000/(8.314*x))*(27.681*(x-298)+7.439/2000*(x^2-298^2)-1.431/(3*10^6)*(x^3-298^3))=-(241.8*X1+802.8*X2+1428.7*X3+1323.2*X4+2043.2*X5+1926*X6+2657.6*X7+2541.5*X8+3146.95*X9+3271.6*X10+283*X11+518.03*X12+180.5*(0.5*15*((0.5*X1+2*X2+3.5*X3+3*X4+5*X5+4.5*X6+6.5*X7+6*X8+7.5*X9+8*X10+0.5*X11+1.5*X12-X14)/0.21*0.79*y+X15)*((0.5*X1+2*X2+3.5*X3+3*X4+5*X5+4.5*X6+6.5*X7+6*X8+7.5*X9+8*X10+0.5*X11+1.5*X12-X14)*(y-1))^0.5*exp(-1542000/(8.314*x))))的解,x1~x15是需要输入的常数,在matlab中应该怎么写这段语言?
y也是需要用户输入的常数~

提问时间：2021-01-23

答案

syms x1 x2 一直到 x15 x y
x=solve('你的方程','x');
x1=
x2=
依次输入你的常数
x=eval(x)
这样你就可以求得你需要的x,但有可能你的方程使用solve是求不出来解析解的.那就需要使用迭代的方法求解了