如何利用excel或者matlab解比较复杂的三元一次方程组

syms x y zex1 = exp(-0.4)+20*exp(-0.2)*(2*sinh(0.2*y)-sinh(0.2))-x;ex2 = 0.5+2*(0.5-x)-y;ex3 = exp(-0.4)-80*exp(-0.2)*cosh(0.2*y)-z;[x,y,z] = solve(ex1,ex2,ex3,'x,y,z');x = double(x)y = double(y)z = double(z)% 验证subs(ex1)<=epssubs(ex2)<=epss