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[求助] 求助matlab多元非线性公式拟合

拟合公式是y=a*u1*x1^b*x2^c+d，求各位大神帮帮忙，怎么能拟合出来a、b、c、d的值
数据
y=
1.10887 1.26187 1.41188 1.43181 1.5255
1.04259 1.21153 1.3583 1.33986 1.42259
1.02049 1.16037 1.31669 1.34609 1.43247
1.02751 1.15435 1.26374 1.32915 1.41636
1.01109 1.14027 1.20874 1.29217 1.39264
1.00504 1.15057 1.20348 1.28213 1.3838
0.99624 1.12104 1.17971 1.26301 1.34574
0.98758 1.11117 1.18319 1.23801 1.33905
0.98206 1.11275 1.1818 1.24154 1.32837
0.97466 1.1004 1.17744 1.23052 1.32127
0.97662 1.096 1.17515 1.22118 1.3219
0.96957 1.09134 1.16622 1.21124 1.30494
0.97155 1.08797 1.15702 1.20413 1.28694
0.96537 1.07644 1.14653 1.19761 1.28586
0.95364 1.06431 1.14465 1.18881 1.27439

u1=
1.0299E-06 5.15172E-07 3.467E-07 2.58468E-07 1.95845E-07
1.63482E-06 8.17584E-07 5.47635E-07 4.09492E-07 3.18879E-07
2.14219E-06 1.07125E-06 7.16419E-07 5.36237E-07 4.21365E-07
2.59507E-06 1.29767E-06 8.67162E-07 6.49393E-07 5.12581E-07
3.0113E-06 1.50578E-06 1.00575E-06 7.53406E-07 5.96286E-07
3.40049E-06 1.70037E-06 1.13536E-06 8.50668E-07 6.74473E-07
3.76853E-06 1.88438E-06 1.25795E-06 9.42651E-07 7.48362E-07
4.11939E-06 2.0598E-06 1.37483E-06 1.03034E-06 8.18765E-07
4.45588E-06 2.22805E-06 1.48693E-06 1.11445E-06 8.86261E-07
4.78012E-06 2.39016E-06 1.59495E-06 1.19549E-06 9.51277E-07
5.0937E-06 2.54695E-06 1.69943E-06 1.27387E-06 1.01414E-06
5.39791E-06 2.69905E-06 1.80079E-06 1.34991E-06 1.07511E-06
5.69377E-06 2.84698E-06 1.89937E-06 1.42387E-06 1.1344E-06
5.98214E-06 2.99116E-06 1.99545E-06 1.49595E-06 1.19218E-06
6.26371E-06 3.13195E-06 2.08928E-06 1.56633E-06 1.24859E-06

x1=
1978.4251453093553640154294600451
1570.2866905132079523661438425993
1371.7745765331634431684449942091
1246.3411879075225502227276914923
1157.0013767280485803785763566605
1088.7804255481133105960949313445
1034.2483447576980118985740563234
989.22317112575878336933452111429
951.13795751279112259841873901588
918.31372628898228834357309691015
889.59751798536192051172990753674
864.16647872281749007739881906717
841.41467311500177898951745668694
820.88417362370988397303247871942
802.22125942281358533548757329618

x2=
0.0838,0.1676, 0.2513, 0.3351, 0.4189

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