Question

tính nhanh

a)100-98+96-94+...+4-2

b)1+2-3-4+5+6-7+-8+9+10-11-12+13+2010

c)(864x11-423x4):(432x(3+6+9+...+27-132))

d)1x2+2x3+3x4+...+99x100

e)\(\frac{1+\left(1+2\right)+\left(1+2+3\right)+\left(1+2+3+4\right)+...+\left(1+2+3+...+99\right)}{1x9+2x98+3x97\: +....+99x1}\)

giúp mk với , mk tick cho 3 tick , nha !!!!

Answer 1

help meeeeeeeeeeeeeee

Answer 2

mk chua gap dang nay bao gio

Answer 3

a,100-98+96-94+...+4-2

day tren so so so hang la (100-2):2+1=50

Có tất cả số cặp 5:2=25 cap

100-98+96-94+...+4-2=2+2+..+2=2.25=50

Answer 4

b, B=1+2+2010+5-3+6-4+9-7+10-8+13-11-12=2013+2.5-12=2011+10=2021