“(100000000*100000000000315^(1/2))/63 + 1000000000000000/63"

3.174603174605675e+013
再问： (100000000*100000000000315^(1/2))/63 + 1000000000000000/63 1000000000000000/63 - (100000000*100000000000315^(1/2))/63 1000000000000000/63 - (100000000*100000000000315^(1/2)*tan(-100000000*100000000000315^(1/2)*(C3 - t/100000000000000)*i)*i)/63 matlab中解微分方程得到，你能不能简化一下啊？ 让t=0，上式等于2000000，求出C3。