2.观察下面备题的计算过程和结果,判断是否正确,对的画“√”错的画“×”,并改正过来
(1)
14.3-($\frac{3}{5}$+2.4÷2$\frac{2}{3}$)
=14.3-($\frac{3}{5}$+9)
=14.3-9.6
=4.7
(2)
8×$\frac{3}{5}$+8×$\frac{2}{5}$+8
=8×($\frac{3}{5}$+$\frac{2}{5}$+8)
=72
(3)
12.75-[6$\frac{1}{6}$-(4.5+1$\frac{2}{3}$)]
=12.75-[6$\frac{1}{6}$-6$\frac{1}{6}$]
=12.75-0
=12.75.