1/2X1/3-1/3X1/4-1/4X1/5-1/5X1/6.-1/39X1/40

1x1\3+2x1\4+3x1\5+.+2006x1\2008的简便算法 提问:1x1/2+1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6+1/6x1/7 用简便方法 用图解法求线性规划?max z = x1+3x2 5x1+10x≤50 X1+X2≥1 X2≤4 X1,X2≥0 float x1,x2; x1=3/2; x2=x1/2; printf("%d%.1f",(int)x1,x2); 输 min=(4*x1^2+2*x2^2+4*x1*x2+2*x2+1)*exp(x1); 求非齐次线性方程组：2x1-x2+4x3-3x4=-4;x1+x3-x4=-3;3x1+x2+x3=1;7x1+7x3- 已知方程3x²-4x=-1的两根是x1 x2,不解方程,求：1.x2/x1 + x1/x2 2.（x1 - 2 1.1x1.1x1.1-1.1x1.1-0.11 简算1.1x1.1x1.1-1.1x1.1-0.11! X2/X1(X1+X2)+X3/(X1+X2)(X1+X2+X3)+.Xn/（x1+x2+...Xn-1)(X1+X2. 能简算就简算.3/20÷2/5-1/5X1/4 已知X1 X2为方程5X平方-3X-1=0且X1＞X2求X1-X2