我要求解一含参数的方程组的解析解
但是由于表达式很长，用matlab编程后给出的结果是不能得到精确解。
我的方程组具体形式为
方程1：

(637386925243169/2251799813685248/pn-5180055772525263/4398046511104/pnnq^(1733/10000)/(-11578912971643945/1099511627776+78104000/8267*pnnq^(8267/10000))+1733/10000/pnnq)*x1+5448149016763729/72057594037927936/pb*y1+1/pg*z1+5180055772525263/4398046511104/pnnq^(1733/10000)/(-11578912971643945/1099511627776+78104000/8267*pnnq^(8267/10000))-1733/10000/pnnq=0;

方程2：  2729593566682847/18014398509481984/pn^(3953278343765083/2251799813685248)*pg/(31/50/pn^(6805914120319341/9007199254740992)*pg+pg^(2201285134421651/9007199254740992)*(270335548836987699/225179981368524800-7390686236677931/9007199254740992*(pg/pn)^(6805914120319341/9007199254740992)))*x1+(-4163090313822763/4503599627370496/pb-5180055772525263/4398046511104/pbbq^(1733/10000)/(-11578912971643945/1099511627776+78104000/8267*pbbq^(8267/10000))+1733/10000/pbbq)*y1+2201285134421651/9007199254740992/pg^(6805914120319341/9007199254740992)*(270335548836987699/225179981368524800-7390686236677931/9007199254740992*(pg/pn)^(6805914120319341/9007199254740992))/(31/50/pn^(6805914120319341/9007199254740992)*pg+pg^(2201285134421651/9007199254740992)*(270335548836987699/225179981368524800-7390686236677931/9007199254740992*(pg/pn)^(6805914120319341/9007199254740992)))*z1=0;

方程3：

31/50*pg^(6805914120319341/9007199254740992)/pn^(7906556687530167/4503599627370496)/(270335548836987699/225179981368524800-7390686236677931/9007199254740992*(pg/pn)^(6805914120319341/9007199254740992))*x1+5448149016763729/72057594037927936/pb*y1+(-31/50/pg^(8805140537686603/36028797018963968)/pn^(6805914120319341/9007199254740992)/(408535545183038231/340295706015967050-139611588448485376/170147853007983525*(pg/pn)^(6805914120319341/9007199254740992))+1733/10000/pggq-6805914120319341/9007199254740992/pg-5180055772525263/4398046511104/pggq^(1733/10000)/(-44079523192218901/4398046511104+78104000/8267*pggq^(8267/10000)))*z1=0;

其中pnnq，pbbq，pggq皆为参数，x1，y1，z1为要求解变量，其结果应该用pnnq，pbbq，pggq表示出来，但是我用solve函数求解方程组后，却没有结果。

怎么办呢？有好的建议没呢，求助大家，请大家帮我解决这个难题吧，真的很着急呀。。。。