tổng 3 can là 15x3=45lít
can thứ 3 đựng 45-(12+16)=17 lít
đs 17 lít
b=(15x3^2-16:2^2)x(3+3^2+3^3+3^4+...+362007)x(36x333-111x108)
1:tính nhanh
A=-3^17[2^3+3^17]
B=3^17+-5^13+-18^35+14^17+17^-35
Chứng tỏ:
a, 3/2*5 + 3/5*8 + 2/8*11 + 3/11*14 +3/14*17 + 3/17*20 < 1/2
b, 1/2^2 + 1/3^2 +...+ 1/100^2 < 1
tính nhanh
A=(2^17+4^17)(3^14-3^12)(2^4-4^2)/1^52+5^3
tính giá trị biểu thức :
a ( 1/6 + 5/9 ) + 4/9
b 3/17 + (14/17 - 2/3 )
c ( 3/2 - 2/3 ) + 7/6
3/2*5 + 3/5*8 + 3/8*11 + 3/11*14 + 3/14*17 + 3/17*20
a,-8/3+7/5+-71/15<x<-13/7+19/14+-7/2
b,-19/6+-15/2+11/3<x<-5/4+19/12+-10/3
c,-6/7+3/35<x<-2/5+3/7
d,x=3/4+1/-12
e,x/14=1/7+-3/14
f,11/18+13/6=85/x
g,8/17+5/17<x/17<6/17+9/17