1/3x1/3÷1/3+2/3x2/3÷2/3=1/3x1+2/3x1=1
1/3x1/3÷1/3 + 2/3x2/3÷2/3= 1/3x(1/3÷1/3) + 2/3x(2/3÷2/3)= 1/3x1 + 2/3x1 =1/3+2/3= 1