在网上查找了很多相同问题的答案，但是都没有合适的方法解决我的问题，求大神们指点

K1=442.3926125;K2=45483.17187;K3=0.000253321;K4=22987873.07;K5=6.301410878;

K6=2.537198529;K7=3.82405E+17;K8=1.79031E+23;K9=1.65563E-22;K10=5.751160296;

K11=115.997776;K12=2819719195;K13=16056077273;K14=2.107894631;K15=1.36646E+12;

K16=1.0507E+15;K17=8785.72203;K18=238699.3468;K19=585427.5027;K20=294600207.6;

F=@(x)[(0.5*x1+K1*x1*x2+2*K2*x1^2*x2+3*K3*x1^3*x2+3*K4*x1^3*x2^2+2*K7*x1^2*x6+3*K8*x1^3*x6+4*K9*x1^4*x6+K17*x1*x2*x3+K18*x1*x2^2*x3+2*K19*x1^2*x2^2*x3+3*K20*x1^3*x2^2*x3)*x7-0.2;

(x2+K1*x1*x2+K2*x1^3*x2+2*K4*x1^3*x2^2+K5*x2*x5+K6*x2*x5^2+K10*x2*x3+K11*x2*x3^2+K14*x2*x4^2+K17*x1*x2*x3+2*K18*x1*x2^2*x3+2*K19*x1^2*x2^2*x3+2*K20*x1^3*x2^2*x3)*x7-0.172;

(0.5*x3+K10*x2*x3+2*K11*x2*x3^2+2*K15*x3^2*x6+3*K16*x3^3*x6+K17*x1*x2*x3+K18*x1*x2^2*x3+K19*x1^2*x2^2*x3+K20*x1^3*x2^2*x3)*x7-0.05;

(0.5*x4+3*K12*x4^3*x6+4*K13*x4^4*x6+2*K14*x2*x4^2)*x7-0.41;

(0.5*x5+K5*x2*x5+2*K6*x2*x5^2)*x7-0.04;

(x6+K6*x2*x5^2+K7*x1^2*x6+K8*x1^3*x6+K9*x1^4*x6+K12*x4^3*x6+K13*x4^4*x6+K15*x3^2*x6+K16*x3^3*x6)*x7-0.03;

x1+x2+x3+x4+x5+x6+K1*x1*x2+K2*x1^2*x2+K3*x1^3*x2+K4*x1^3*x2^2+K5*x2*x5+K6*x2*x5^2+K7*x1^2*x6+K8*x1^3*x6+K9*x1^4*x6+K10*x2*x3+K11*x2*x3^2+K12*x4^3*x6+K13*x4^4*x6+K14*x2*x4^2+K15*x3^3*x6+K16*x3^3*x6+K17*x1*x2*x3+K18*x1*x2^2*x3+K19*x1^2*x2^2*x3+K20*x1^3*x2^2*x3-1];

x0=[0.7;0.3;0.5;0.7;0.2;0.5;0.5];

x=fsolve(F,x0)

报错

Undefined function or variable 'x1'.

Error in

@(x)[(0.5*x1+K1*x1*x2+2*K2*x1^2*x2+3*K3*x1^3*x2+3*K4*x1^3*x2^2+2*K7*x1^2*x6+3*K8*x1^3*x6+4*K9*x1^4*x6+K17*x1*x2*x3+K18*x1*x2^2*x3+2*K19*x1^2*x2^2*x3+3*K20*x1^3*x2^2*x3)*x7-0.2;(x2+K1*x1*x2+K2*x1^3*x2+2*K4*x1^3*x2^2+K5*x2*x5+K6*x2*x5^2+K10*x2*x3+K11*x2*x3^2+K14*x2*x4^2+K17*x1*x2*x3+2*K18*x1*x2^2*x3+2*K19*x1^2*x2^2*x3+2*K20*x1^3*x2^2*x3)*x7-0.172;(0.5*x3+K10*x2*x3+2*K11*x2*x3^2+2*K15*x3^2*x6+3*K16*x3^3*x6+K17*x1*x2*x3+K18*x1*x2^2*x3+K19*x1^2*x2^2*x3+K20*x1^3*x2^2*x3)*x7-0.05;(0.5*x4+3*K12*x4^3*x6+4*K13*x4^4*x6+2*K14*x2*x4^2)*x7-0.41;(0.5*x5+K5*x2*x5+2*K6*x2*x5^2)*x7-0.04;(x6+K6*x2*x5^2+K7*x1^2*x6+K8*x1^3*x6+K9*x1^4*x6+K12*x4^3*x6+K13*x4^4*x6+K15*x3^2*x6+K16*x3^3*x6)*x7-0.03;x1+x2+x3+x4+x5+x6+K1*x1*x2+K2*x1^2*x2+K3*x1^3*x2+K4*x1^3*x2^2+K5*x2*x5+K6*x2*x5^2+K7*x1^2*x6+K8*x1^3*x6+K9*x1^4*x6+K10*x2*x3+K11*x2*x3^2+K12*x4^3*x6+K13*x4^4*x6+K14*x2*x4^2+K15*x3^3*x6+K16*x3^3*x6+K17*x1*x2*x3+K18*x1*x2^2*x3+K19*x1^2*x2^2*x3+K20*x1^3*x2^2*x3-1]

报错为

Error in fsolve (line 218)

fuser = feval(funfcn{3},x,varargin{:});

Error in gongcun (line 13)

x=fsolve(F,x0)

Caused by:

Failure in initial user-supplied objective function evaluation. FSOLVE cannot

continue.

请问是格式有误吗？原来用syms solve函数解不出来，然后用fsolve数值函数迭代求解，困扰啊