1.3/7 × 49/9 - 4/3 2.8/9 × 15/36 + 1/27 3.12× 5/6 – 2/9 ×3 4.8× 5/4 + 1/4 5.4/7 × 5/9 + 3/7 × 5/9 6.7/8 + ( 1/8 + 1/9 ) 7.9 × 5/6 + 5/6 8.3/4 × 8/9 - 1/3 9.7 × 5/49 + 3/14 10.6 ×( 1/2 + 2/3 )