Tìm x biết 5^x+3 + 5^x = 126.5^3
Bai 1:
a) 5^x+3 + 5^x =126.5^3
Bai 2:tim tat ca cac so nguyen n de bieu thuc
A=2n+2007/n+2 ( voi n khac -2 ) co gia tri nguyen
Bai 3 :tinh P/Q biet :
P=1/2.32+1/3.33+.........+1/n(n+30)+......+1/1973.2003
Q=1/2.1974+1/3.1975+......+1/n+(n+1972)+.........+1/31.2003
a) 5^x+3 + 5^x =126.5^3
Bai 2:tim tat ca cac so nguyen n de bieu thuc
A=2n+2007/n+2 ( voi n khac -2 ) co gia tri nguyen
Bai 3 :tinh P/Q biet :
P=1/2.32+1/3.33+.........+1/n(n+30)+......+1/1973.2003
Q=1/2.1974+1/3.1975+......+1/n+(n+1972)+.........+1/31.2003