简单变化成等式: a+x*b-(x*y)*c-(x^2*y)*d=y。x,y已知问题转化为矩阵计算,A*B=C,已知A,C求B A= a b c d 1 0.4182 -0.4182000 -0.17489124 1 0.3455 -0.2855903 -0.09867145 1 0.5091 -0.4599718 -0.23417167 1 0.6182 -0.5337539 -0.32996665 C= y 1.0000 0.8266 0.9035 0.8634 求B=solve(A)%*%C,得a,b,c,d a 1.020080 b -2.688923 c -2.264754 d -0.899455