(-1)+(+2)+(-3)+(+4)+.+(-41)+(+42)
5个回答
负数组成一数列,正数组成另一数列.
0.5*21*(2+42-1-41)=21
相关问题
计算(-1)+(+2)+(-3)+(+4)+……+(-41)+(+42)=
计算(-1)+(+2)+(-3)+(+4)+……+(-41)+(+42)=要过程
计算-{-【-(-5)】} -{+【-(+5)】}(-1)+(+2)+(-3)+(+4)+...+(-41)+(+42)
(1) (-1)+(+2)+(-3)+(+4)+.+(-41)+(+42) (2)1+2-3-4+5+6-8+9+…+1
第41.41:2.3题 42:2.3题
2,2/3,1,11/10,20/21,() A.36/41 B.36/42 C.32/41 D.32/42
1又1/2-2又5/6+3又1/12-4又19/21—5又1/30+6又41/42-6又41/42—7又1/56+8又7
1+1/2-2--+5/6+3+1/12-4+19/20-5+1/30+6+41/42-7-1/5
1*1/2-2*5/6+3*1/12-4*19/20+5*1/30-6*41/42+7*1/56-
编号:1 2 3 4 5 6 7 8 9 10 体重/千克:36 41 40 39 42 41 40 40 45 40