(1-2)(2-3)(3-4)……(999-1000)=?
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(-1)+2+(-3)+4+…+(-99)+100
(2+4+6+……+100)-(1+3+5+……+99)简便计算
(100+98+96+……+4+2)-(99+97+95+……+3+1)
1+2+3……+99+100+99+98+……+3+2+1=( )
(-1)+2+(-3)+4+(-5)+6……+(-99)+100=
1-(2-3)-(4-5)-(6-7)-……-(98-99)=
计算3*(1*2+2*3+3*4+……+99*100)等于有奖
1+(-2)+3+(-4)+……+99+(-100)得数是多少
1+(﹣2)+3+(﹣4)+……+99+(﹣100)等于?
来来来,(-1)+2+(-3)+4……+(-99)+100等于多少
1/(1+2) + 1/(1+2+3) + 1/(1+2+3+4)……+1/(1+2+3+4+……+99+100)=( )
1+(-2)+3+(-4)+5+(-6)+……+99+(-100)+…+2007+(-2008)
1、 3+(-6)+6+(-9)+9+……+27+(-30) 2、 (-1)+2+(-3)+4+……+(-99)+100
1/(1*2)+1/(2*3)+1/(3*4)+……+1/(98*99)+1/99*100
(-9)+(-19)+(-29)+……+(99) 和(+1)+(-2)+(+3)+(-4)+……+(+99)+(-100)
99÷(99+1)÷(99+2)x(99+3)÷(99+4)÷(99+5)x(99+6)÷……÷(99+101)
计算:(+1)+(-2)+(+3)+(-4)+……(+99)(-100)(+101)
(1-2)(2-3)(3-4)……(99-100)