a=1phan 15+1phan21+1phan28+1phan36+1phan45+1phan50+1phan60
tinh tong M=10\56+10\140 +.............+10\1400
tinh tổng :M=10/56+10/140+......+10/1400
A) tinh 10^2 ; 10^3 ;10^4 ; 10^5 ; 10^6
b
tinh nhanh
10/56+10/140+10/260+...+10/1400
tinh 10^2; 10^3;10^4;10^5;10^6
tinh: 10:(10^6+1)/10^5+1=? (kq là 1 phân số)
(2x+1).(y-3)=10
khong duoc tinh so am cung khong tinh so duong luon
chi duoc tinh bang so tu nhien
Tinh:
A= (10^3-1}^1.(10^3-2)^2.(10^3-3)^3.........(10^3-100)^100
