一个mathematica程序添加作图语句Clear[x,y,n,h,S1,S2,S3,S4,i];y[1] = 0; h = 0.1;n = 100Do[x[i] = 1.0 + (i - 1)*h,{i,1,n + 1}]f[x_,y_] = 2.5-0.8 y;Do[{S1 = f[x[i],y[i]],S2 = f[x[i] + h/2,y[i] + h*S1/2],S3 = f[x[i] + h/2,y[i] + h*S2/2],S4 = f[x

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