3:
1: Khi a=3 và b=2 thì \(A=1120-\left[125+3\left(17-2\right)^2\right]+25=345\)
2: \(B=\dfrac{2^{11}\cdot5^7+5^{10}\cdot2^8}{2^8\cdot5^4+5^7\cdot2^5}=\dfrac{2^8\cdot5^7\left(2^3+5^3\right)}{2^5\cdot5^4\left(2^3+5^3\right)}=10^3=1000\)
3:
Khi a=3; b=5;c=7;d=1 thì
P=5*3*5^2-3^3+7=355
5:
2A=2+2^2+...+2^101
=>A=2^101-1