1/4×5+1/5×6+1/6×7+……+1/39×40
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1/4×5+1/5×6+1/6×7+……+1/39×401/4×5+1/5×6+1/6×7+……+1/39×401/4×5+1/5×6+1/6×7+……+1/39×401/4×5+1/5×6+1/6×
1/4×5+1/5×6+1/6×7+……+1/39×40
1/4×5+1/5×6+1/6×7+……+1/39×40
1/4×5+1/5×6+1/6×7+……+1/39×40
1/4×5+1/5×6+1/6×7+……+1/39×40
=(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+.+(1/39-1/40)
=1/4-1/5+1/5-1/6+1/6-1/7+.+1/39-1/40
=1/4-1/40
=9/40
1/4×5+1/5×6+1/6×7+……+1/39×40
1/4*5+1/5*6+1/6*7+……+1/39*40
1+2+3+4+5+6+7……+105
1+2+3+4+5+6+7+8+……………………………………96+97+98+99+100=
1/3*4+1/4*5+1/5*6+1/6*7+……+1/99*100=?求规律!
1+2+3+4+5+6……………………+100000000=?
(1+3+5+7+……+39+41)/(2+4+6+8+……+40+42)
1+2+3+4+5+6+7+8+9+…………+99+100简算
1+2+3+4+5+6+7+8+9…………2000+2001+2002
1+2+3+4+5+6+7+…………997+998+999+1000
1×2×3×4×5×6×7×8×9×10…………×100000
(1+3+5+7……+2013)+(2+4+6+8……+2012)
1+2+3+4+5+6+7…………50+=
1+2+3+4+5+6+7…………+99+100=?5050?
1+2+3+4+5+6+7+8+9+10+12+13+14+……………………………………………………+9997+9998+9999+10000=?
1/2×4+1/3×5+1/4×6+1/5×7+……+1/8×10+1/9×11
1+2+3+4+5+6+7+8+9………………+500=多少?
1+2+3+4+5+6+7………………+100＝?要公式