10.P(A)=C(4,5)/C(7, 10)= 5/( 10 * 9 * 8/3 * 2 * 1)= 5/( 10 * 3 * 4)= 1/24
1 1 . f(X)= SIN(2X- 1/3? )+ 1”log(2,t),f(x)min =- 1+ 1 = 0 & gt; =log(2,t),log(2, 1)>=log(2,t),0 & ltt = & lt 1
13.f (x) = f (x+4), t = 4, g (x) = 0, f (x) = log {a, (x+2)}, there must be one, there must be one, and there is only one problem, that is, x=6. log{a,8}, 1 & lt; a & lt2