3/(1X4)+3/(4X7)+3/(7X10)+3/(10X13)+3/(13X16)
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3/(1X4)+3/(4X7)+3/(7X10)+3/(10X13)+3/(13X16)3/(1X4)+3/(4X7)+3/(7X10)+3/(10X13)+3/(13X16)3/(1X4)+3/(4
3/(1X4)+3/(4X7)+3/(7X10)+3/(10X13)+3/(13X16)
3/(1X4)+3/(4X7)+3/(7X10)+3/(10X13)+3/(13X16)
3/(1X4)+3/(4X7)+3/(7X10)+3/(10X13)+3/(13X16)
3/(1×4)+3/(4×7)+3/(7×10)+3/(10×13)+3/(13×16)
=1-1/4+1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16
=1-1/16
=15/16
1-1/4+1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16=1-1/16=15/16
100x( 3/1x4 + 3/4x7 +3/7x10 +.3/97x100)=?注：1x4、4x7、7x10等均为分母的大小
3/(1X4)+3/(4X7)+3/(7X10)+3/(10X13)+3/(13X16)
1x4+4x7+7x11+……+n(n+3)=?分解因式啊~~~
x1-x2+x3=1x2-x3+x4=21若x1,x2,x3,x4,x5满足方程组 x3-x4+x5=3x4-x5+x1=4x5-x1+x2=5求x2 x3 x4的值2已知 x1+x4+x6+x7=39 x2+x4+x5+x7=49 x3+x5+x6+x7=41 x4+x7=13 x5+x7=14 x6+x7=9 x1+x2+x3+x4+x5+x6+x7=9求x7的值若x1,x2,x3,x4,x5满足方程组 x1-x
lim[1/(1x4)+1/(4x7)+1/(7x10)+...+1/(3n-2)x(3n+1)]=_____
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9=
巧算：1x2+2x3+3x4+4x5+5x6+6x7...+8x9
帮我用lingo或者lindo算个题呗?x1+x4+x5+x6+x7>20x1+x2+x5+x6+x7>13x1+x2+x3+x6+x7>10x1+x2+x3+x4+x7>12x1+x2+x3+x4+x5+>16x2+x3+x4+x5+x6+>18x3+x4+x5+x6+x7>20格式不对也改下哈,>在lingo中应该和>=一样吧?min=(5x1+4x2+3x3+3x4+3x5+3x6+4x7)
5分之3x4分之9x7分之5
1/1x3+1/2x4+1/3x5+1/4x6+1/5x7+1/6x8
1/1x2+2/1x3+3/1x4+4/1x5+5/1x6+6/1x7=
1/2x4+1/3x5+1/4x6+1/5x7+.1/8x10+1/9x11
1/2x4+1/3x5+1/4x6+1/5x7+...+1/97x99=?RT
(2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==?
计算：1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10.
简便方法计算-14X4分之3-0.34X7分之3+4分之1X(-14)+7分之4X(-0.34)
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8