联立四个方程解方程组,用mathematica怎么做啊?

类似以下格式,自己看吧,我估计你mathematica符号表达式用不来,建议借书看看,肯定有例题
Solve[{x*(0.160549*0.21372*(1 - y*Exp[-2z]) - a) == 0.00137,
x*(0.206949*0.21372*(1 - y*Exp[-16z]) - a) == 0.00393,
x*(0.346149*0.21372*(1 - y*Exp[-109z]) - a) == 0.01332,
x*(0.357749*0.21372*(1 - y*Exp[-207z]) - a) == 0.01453},{x,y,z,a}]