1x3+2x4+3x5+4x6……+100x102=?
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1x3+2x4+3x5+4x6……+100x102=?
1/1x3+1/2x4+1/3x5+1/4x6+……+1/19x21 急,
1x2÷1+2x3÷1+3x4÷1+4x5÷1+5x6÷1等于?
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
1/1x3+1/2x4+1/3x5+1/4x6+...+1/10x12
为什么1/2+5/6+11/12+19/20+…………+89/90 的规律是1X2.2X3.3X4.4X5.5X6.6X7.
1x3+2x4+3x5+…9x11
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
1/1x3+1/2x4+1/3x5+1/4x6+...+1/100x102=?
1x3+2x4+3x5+4x6..+99x101=?
1x2+2x3+3x4+4x5+5x6---+99x100=?
1x2+2x3+3x4+4x5+5x6+.+99x100
巧算:1x2+2x3+3x4+4x5+5x6+6x7...+8x9
X1+X2+X3+X4+X5+X6+X7=2010,X1+X2=X3,X2+X3=X4,X3+X4=X5,X4+X5=X6,X5+X6=X7求X3最大值
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9=?急!
1x2÷1+2x3÷1+3x4÷1+4x5÷1+5x6÷1.+n(n+1)÷1
1 1 1 1 1 ——+——+——+——+```````` —— 2X3 3X4 4X5 5X6 99X100