[tex]1)a)7.8 \div 2 + 9.5 \times 3.4 = 3.9 + 32.3 = 36.2 \\ b)5.71 \times 10 - 4.3 = 5.71 - 4.3 = 52.8 \\ c)8.35 - 3.89 + 11.1 = 19.45 - 3.89 = 15.56 \\ d)57 \div 2.5 = 22.8[/tex]
