Tinh nhanh
1-2-3+3-4-5+.....+97-98-99
tinh nhanh
a) A= 33(1-2/3)(1-2/5)...(1-2/99)
b) B=101+100+99+98+...+3+2+1/101-100+99-98+...+3-2+1
c) C=423134x846267-423133/423133x846267+423134
Tinh nhanh:
m)5^1+5^2+5^3+...+5^199+5^200
n)3^0-3^2+3^3-3^4+...+3^2017-3^2018+3^2019-3^2020
o)6+6*9+6*9^2+6*9^3+...+6*9^99
p)(-1)*(-1^2)*(-1^3)*(-1^4)*...*(-1^99)*-(1^100)
Giup minh nhe!
tinh nhanh 1+2+3+4+5+.........+99+100= ?
tinh nhanh 1*3+2*4+3*5+4*6+........+97*99+98*100 bang bao nhieu
tinh nhanh
a,48x36+24x28
b,47x12+53x13
c,A=101+10+99+........+3+2+1/101-100+99-98+...........3-2+1
tinh nhanh
100-99+98-97+96-95+......-3+2-1
tinh nhanh.
(-1)+2+(-3)+4+(-5)+6+......+(-99)+100
Tinh nhanh:
S=(-1-)+2+(3)+4+(-5)+6+......+(-99)+100