1) 40/9×5/8 + 5/8×32/4= 25/9+20/9= 45/9= 5....... 2) 31/8×4/5 - 13/8×4/5= 31/10-13/10=18/10=9/5=1 4/5........3) 34/15×20/19 - 20/19×3/10 - 7/6×20/19= 136/57-6/19-70/57= 136-18-70/57= 48/57...... 4) 43/9×27/14 - 43/12×27/14 + 27/14×31/18= 129/14-1161/168+93/28= 1548-1161+558/168= 945/168= 5 105/168= 5 35/56