= 3^2. 5^3 +3^4
=3^2 . 5^3 +3^2. 3^2
=3^2. (5^3+ 3^2)
=3^2. (125+9)
=9.134
=1206
32.53+92= 6 . (10 . 5) + 18= 6 . 50 + 18= 300 + 18 = 318
a,1/1*2+1/2*3+1/3*4+1/4*5+......+1/9*10
b,2/1*3+2/3*5+2/5*7+2/7*9+2/9*11
c,3/1*3+3/3*5+3/5*7+3/7*9+3/9*11
d,5/1*3+5/3*5+5/5*7+5/7*9+5/9*11
Giúp mình với
a,1/3+2/3+...+3 1/3+3 2/3=...........
b,9+9/2+9/4+9/8+...+9/128+9/256=...........
c,5/3+5/3*5+5/5*7+...+5/101*103=.......
* là dấu nhân ,còn 3 2/3 là hỗn số
Các bạn giúp mình nhanh với nhé
Tính
1/3 - 3/5 + 5/7 - 7/9 + 9/11 - 11/13 - 9/11 + 7/9 - 5/7 + 3/5 - 1/3
so sanh:A=(1+5+5^2+..+5^9/)1+5+5^2+...+5^8)voi B=1+3+3^2+..+3^9/1+3+3^2+..+3^9
so sanh:A=(1+5+5^2+..+5^9/)1+5+5^2+...+5^8)voi B=1+3+3^2+..+3^9/1+3+3^2+..+3^9
1/3-3/5+5/7-7/9+9/11-11/13+13/15+11/13-9/11+7/9-5/7+3/5-1/3
Tính nhanh:
a) ( 3/29 - 1/5) . 29/3
b) 3/4 . 7/9 + 1/4 . 7/9
c) 1/7 . 5/9 + 5/9 . 1/7 + 5/9 . 3/7
d) 4 . 11 . 3/4 . 9/121
Bài 1: Tính:
A= ((2^12 . 3^5 - 4^6 . 9^3 ) / 9( 2^2 . 3 )^6 + (8^4 . 3^5))) - ((5^10 . 7^3 - 25^2 . 49^2) / (( 125 . 7 )^3 + 5^9 . 14^3))
B= (2^9 . 27^3 + 15 . 4^9 . 9^4) / (6^9 . 2^0 + 12^10)
tính
a,7 5/11-(2 3/7 + 3 5/11)
b,(-3)/5. 5/7 + (-3)/5. 3/7+ (-3)/5. 6/7
c,1/3.4/5+1/3.6/5-4/3
d,5/9 . 7/13 + 5/9 . 13 - 5/9 . 3/13
tính nhanh: 1/3-3/5+5/7-7/9+9/11-11/13+13/15+11/13-9/11+7/9-5/7+3/5-1/3
