1)2 3/7 ×7=17
2 3/7 × 7 = 17/7×7/1=17
2)(2/9 + 1 2/3 ) ×3=2 45/84
1)2/9 + 1 2/3 =1 6/9 + 2/9 = 1 8/9
2)1 8/9 ×3 = 17/9 ×3/1 = 17/3=5 2/3
3)5/12× 2 3/7 + 5/12×3 4/7=2 45/84
1)5/12 × 2 3/7 = 5/12 ×17/7= 85/84= 1 1/84
2)5/12×3 4/7=5/12 ×25/7=125/84=1 41/84
3)1 41/84+1 1/84=2 45/84.