= −10 − 20 − 23 + 1 − 2^3
= -10 - 20 - 23 + 1 - 8
= -30 - 23 + 1 - 8
= -53 + 1 - 8
= -52 - 8
= -60
= −10 − 20 − 23 + 1 − 2^3
= -10 - 20 - 23 + 1 - 8
= -30 - 23 + 1 - 8
= -53 + 1 - 8
= -52 - 8
= -60
chứng minh các số sau là số chính phương
B=10^5+8^2017
C=20^52017
D=19^k+5^k+1995^k+1996^k(k là số chẵn)
E=1.2+2.3+3.4+...+2012.2013
F=1+2^5+3^9+4^13+...+199^793+7
H=2^3+2^4+2^5+..+2^10
K=1...12..20...0(2012 cs 1,2,0)
M=23^5+23^12+23^2003
P=abc+bca+cab
So sánh
a) (-20) : (-4) với 0
b) (-370) : 10 với 10
c) 56 : (-7) với 23
sos
a)58.75+58.50-58.25
b) 20:2^2-5^9:5^8
c.(5^19:5^17-4):7
d)_84:4+3^9:3^7+5^0
e)295-(31-2^2.5)^2
f) 11^25 :11^23 -3^5:(1^10)+2^3-60)
a ) - 7 -15 + 30
b )10 x 23 - 10 x (-17)c )21 x 3 -7 x[(-32) + 18]d )-20 - [ 10 x (4 mũ 3 - 54) x 5 mũ 2 + 2 mũ 4]-\(\dfrac{4}{7}\)+\(\dfrac{15}{4}\)-(\(\dfrac{11}{4}\)+\(\dfrac{3}{7}+\dfrac{1}{2}-\dfrac{1}{3}\))
\(\dfrac{1}{5}\left(\dfrac{1}{2}-\dfrac{1}{3}\right):\left(\dfrac{-9}{10}\right)+\dfrac{-7}{3}\)
\(\dfrac{-20}{23}+\dfrac{2}{3}-\dfrac{3}{23}+\dfrac{2}{5}+\dfrac{7}{15}\)
giúp mik với
7^91:7^89+5.5^2-124
4.15+28:7-6^20:6^18
(3^2+2^3):7
11^25:11^23-3^5:(1^10+2^3)-60
5^20:(5^5.6+5^15.19)
1)\(\dfrac{1}{2}+\dfrac{13}{19}-\dfrac{4}{9}+\dfrac{6}{19}+\dfrac{5}{18}\)
2)\(\dfrac{ }{\dfrac{-20}{23}+\dfrac{2}{3}-\dfrac{3}{23}+\dfrac{2}{5}+\dfrac{7}{15}}\)
3)\(\dfrac{ }{\dfrac{4}{3}+\dfrac{-11}{31}+\dfrac{3}{10}-\dfrac{20}{31}-\dfrac{2}{5}}\)
4)\(\dfrac{ }{\dfrac{5}{7}.\dfrac{5}{11}+\dfrac{5}{7}.\dfrac{2}{11}-\dfrac{5}{7}.\dfrac{14}{11}}\)
Bài 1: Tính
a) -3/20 + -7/4
b) 6 2/3 - 4 2/3
c) -3/10 + 7/12
d) 35/-9 . 81/7
e) -2/5 - -3/4
f) 5/23 . 7/26 + 5/23 . 9/26
g) -3/12 : 4/15
h) 1 1/6 - 3 1/3
i) -2/5 . (-3) + 3/8 . 4/-10
j) -13/17 + (13/-21 + -4/17)