\(A=1+2^1+2^2+...+2^{2015}\)
\(2\cdot A=2^1+2^2+2^3+...+2^{2015}+2^{2016}\)
\(2A-A=2^1+2^2+2^3+...+2^{2015}+2^{2016}-\left(1+2^1+2^2+...+2^{2015}\right)\)
\(A=2^{2016}-1\)
\(A=1+2^1+2^2+...+2^{2015}\)
\(2\cdot A=2^1+2^2+2^3+...+2^{2015}+2^{2016}\)
\(2A-A=2^1+2^2+2^3+...+2^{2015}+2^{2016}-\left(1+2^1+2^2+...+2^{2015}\right)\)
\(A=2^{2016}-1\)
a. 1334:1333+17.32
b. 21+22+23+24+25+26+27+28+29
c. 23.39+23.68−23.7
d. {2011+[45−(37−62)]:4}:2022
Tính nhanh :
a, 13 . 23 + 22 - 3 . 17 + 28
b, -48 + 48 . (-78) + 48 . (-21)
Bài 1: Thực hiện phép tính
a) (134 – 34).(-28) + 72.[(-55) – 45]
b) 4.25 – 12.5 + 170:10
c) 369 – (206 – 15) – (-206 + 369)
d) 345 – 150:[(33 – 24)2 – (-21)] +20160
e) 307 - [(180.40 - 160) : 22 + 9] : 2
f) 350.12.173 + 12.27
h, 2019 + (-247) + (-53) – 2019
g) 13.70 – 50.[(19-32) : 2 + 23]
h) 32 : 4 + [60 – (12 – 7)2]
i) 17.85 + 15.17 – 120
Hãy tính : x =a.b vs
a € { 14 ; 22 } , b € {28; 16}
-22 ≤ x ≤ 20
27: 22 +54:53.24-3.25
Mọi người giúp em với
Tính nhanh và hợp lý 21.(13-18)-18.(21-7)
7.x-2+5.x=22
TÌm x
A.-(-3-x+8)-(-3+5)=|5-8|
B.43+(9-21)=317-(x+317)
C.3(x-2)-2(x-4)=-12-2