jika f(xy)=f(x+y) dan f(7)=7 tentukanlah nilai f(49)

jawab

f(7) = 7
f(7.1) = f(7+1) = f(8) = 7
f(8) = 7
f(8.1) = f(8+1) = f(9) = 7
f(9) = 7
f(9.1) = f(9+1) = f(10) = 7
f(10) = 7
f(49)= 7