6 oblicz: 1 3/4×1 1/7-3÷4 1/2=
1 5/7×(2 3/4-1 2/3×4)=
3 1/3×(2 3%4-1 2/3÷4)=
3 1/4+1/2
--------------------------
3 1/3×(1 5/9-1 1/12)=​