1/2x(2/9+3/7-5/27)/1/3x5/7-1/27
(2^7+2^5) x3^x+1=2^5x3^3x5
7^9:7^7-3^2+2^3x5^2 = ????
23.75+25.23=????
-27-15=????
|-5|+(-21)=???
Tìm X
x+3=2^3:2
-x+12=-5
B=12^3x5^4x10^5/8^4x15^3x5^6
A=5/9+2/15-6/9
B=2/7-3/8+4/7+1/7-5/8+5/15
C=3/5+1/15+1/57+1/3-2/9-3/4-1/36
D=1/1x2+1/2x3+1/3x4+...+1/99x100
E=1-3/1x3-3/3x5-3/5x7-...-19
help plssssssss
A=7/1x3 + 7/3x5 + 7/5x7+ .... + 7/201x203
Tính bằng cách thuận tiện.
\(3^2x3^3x3^6+4^5x4^7+5^3x5^6=???\)
(Viết dưới dạng lũy thừa hộ mình nhé. Ai đúng mình tk)
Tính nhanh:
1) A = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + ... + 17 + 18 - 19 - 20
2) B = 1 - 2 - 3 + 4 + 5 - 6 - 7 + 8 + ... + 2013 - 2014 - 2015 + 2016
3) D = 4/13 + 4/3x5 + 4/5x7 + ... + 4/2013x2015
5/1x3+5/3x5+5/5x7+...+5/47x49