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127/1+2727/505+272727/1010102解方程X-1+2/1X+4/1X+8/1X+16/1X+32/1X31X2X3X4/1+2X3X4X5/1+3X4X5X6/1+4X5X6X7/1+5X6X7X8/1+6X7X8X9/1+7X8X9X10/1+8X9X10X11/1+9X10X11X12/1+X10X11X12X13要今天内回答完毕
题目详情
1 27/1 + 2727/505 +272727/101010
2 解方程 X-1+2/1X+4/1X+8/1X +16/1X+32/1X
3 1X2X3X4/1 + 2X3X4X5/1+3X4X5X6/1 +4X5X6X7/1 + 5X6X7X8/1+
6X7X8X9/1+ 7X8X9X10/1 +8X9X10X11/1 +9X10X11X12/1 +X10X11X12X13
要今天内回答完毕
2 解方程 X-1+2/1X+4/1X+8/1X +16/1X+32/1X
3 1X2X3X4/1 + 2X3X4X5/1+3X4X5X6/1 +4X5X6X7/1 + 5X6X7X8/1+
6X7X8X9/1+ 7X8X9X10/1 +8X9X10X11/1 +9X10X11X12/1 +X10X11X12X13
要今天内回答完毕
▼优质解答
答案和解析
1 1/27 +505/ 2727 +101010/272727
=1/27+[5*101]/[27*101]+[10*10101]/[27*10101]
= 1/27+5/27+10/27
=16/27
2 解方程 X-1+2/1X+4/1X+8/1X +16/1X+32/1X
方程不清楚.
3 1/1*2*3*4+1/2*3*4*5+1/3*4*5*6+...+1/10*11*12*13
=1/3[1/1*2*3-1/2*3*4]+1/3[1/2*3*4-1/3*4*5]+1/3[1/3*4*5-1/4*5*6]+...+1/3[1/10*11*12-1/11*12*13]
=1/3[1/1*2*3-1/2*3*4+1/2*3*4-1/3*4*5+1/3*4*5-1/4*5*6+...+1/10*11*12-1/11*12*13]
=1/3[1/1*2*3-1/11*12*13]
=1/3*[1/6-1/1716]
=95/1716
=1/27+[5*101]/[27*101]+[10*10101]/[27*10101]
= 1/27+5/27+10/27
=16/27
2 解方程 X-1+2/1X+4/1X+8/1X +16/1X+32/1X
方程不清楚.
3 1/1*2*3*4+1/2*3*4*5+1/3*4*5*6+...+1/10*11*12*13
=1/3[1/1*2*3-1/2*3*4]+1/3[1/2*3*4-1/3*4*5]+1/3[1/3*4*5-1/4*5*6]+...+1/3[1/10*11*12-1/11*12*13]
=1/3[1/1*2*3-1/2*3*4+1/2*3*4-1/3*4*5+1/3*4*5-1/4*5*6+...+1/10*11*12-1/11*12*13]
=1/3[1/1*2*3-1/11*12*13]
=1/3*[1/6-1/1716]
=95/1716
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