1、(1-2)×(1-2)×(2-3)×(3-4)×(4-5)×…×(99-100
(-1)+(+2)+(-3)+(+4)+(-5)+……+(-99)+(+100)=?
1、(1-2)×(1-2)×(2-3)×(3-4)×(4-5)×…×(99-100
1/2×2/3+1/3×2/4+1/4×2/5+……+1/99×2/100 计算
1-2+3-4+5-6…+99-100等于
1-2+3-4+5…+99-100
1+1+2+2+3+3+4+4+5+5+6+6……+99+99+100+100+111
5+5/1×2+5/2×3+5/3×4+……5/99×100
1\1×2+1\2×3+1\3×4+1\4×5+……+1\99×100 等于多少?
计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2)
1/2*1+1*2*3+1/3*4+………+1/99*100
1×2+2×3+3×4+…+99×100.
1.1/1*2+1/2*3+1/3*4+……+1/99*100 2.2/1*3+2/3*5+2/5*7+……+2/97*