(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100
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(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100(-1)×2×(-3)×4×···×(-
(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100
(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100
(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100
分子中奇数为负,而1-50中有25个奇数,所以整体为负数.
2=1x2,4=2x2,6=3x2
所以分母等于各个分子的2倍.
上下约分后,
原式等于负的2的50次幂分之1.
2[4/3y—(2/3y—1/2)]=3/4y急·································!1
(1994+1992+······+4+2)—(1+3+5+······+1991+1993)=( )
计算(+1)+(-2)+(+3)+(-4)+······+(-100)+(+101)+(-102)
(1+3+5++7+9······+2011)-(2+4+6+8······+2012)=
(1+3+5+······2013)—(2+4+6······+2014)用简便方法哦,这是奥数题.
计算1/(1*4)+1/(4*7)+1/(7*10)+------+1/(97*100)································································································
1+2+3+4+5+······+9999=( ) 急用
1+2+3+4+5+······+100(用简便算法)
1+(-2)+3+(-4)···········+99-100等于多少
秦始皇和汉武帝各自的功劳是?(用1·······2·······3··········来说)
根据1+2+3+4+······+n=n(n+1)/2 计算2+4+6+····+200
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
(-1)×2×(-3)×4×···×(-49)×50/2×4×6×···×100
1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+······+1/(1+2+3+······+200)=?
数学题1*2分之一+2*3分之一+3*4分之一+···············+99*100分之一=( )
(-1)+2+(-3)+4+······+(-2009)+2010+(-2011)=________________________(注意:
计算:(-1)+(+2)+(-3)+(-4)+.+(-99)+(+100)+.+(-2009)+(+2010)快点··········很急
找出小正方形的个数与露在外面的数的变化规律小正方形的个数:1 2 3 4 ······( )······ n露在外面的面数:5 9 13 ( ) ······ 33 ······ ( )