cara menghitung 1 2/3÷2 1/2 - 3/5 × 1 2/7 =

1 2/3 : 2 1/2 - 3/5 . 1 2/7
5/3 : 5/2 - 3/5 . 9/7
5/3 . 2/5 - 27/35
10/15 - 27/35
2/3 - 27/35
(70 - 81)/105
-11/105

= 1 2/3 ÷ 2 1/2 - 3/5 × 1 2/7
= ( 5/3 ÷ 5/2 ) - ( 3/5 × 9/7 )
= ( 5/3 × 2/5 ) - ( 3/5 × 9/7 )
= 10/15 - 27/35
= 70/105 - 81/35
= -11/105