1. 直接写出得数。(7.5分)
99+47=
$\frac{11}{24}×\frac{3}{44}=$
$\frac{7}{10}÷28=$
$6.3÷0.9=$
$100-3.03=$
$10÷10\%=$
$\frac{5}{6}+\frac{2}{3}=$
$\frac{6}{7}+\frac{1}{7}÷\frac{1}{8}=$
$0.4×0.05=$
$12-2\frac{1}{3}=$
$\frac{3}{5}×2.5=$
$\frac{5}{7}+\frac{2}{21}-\frac{5}{7}+\frac{2}{21}=$
$3.6÷\frac{4}{9}=$
$\frac{5}{8}+0.375=$
$1÷\frac{2}{3}-\frac{2}{3}÷1=$

146
$\frac{1}{32}$
$\frac{1}{40}$
7
96.97
100
$\frac{3}{2}$
2
0.02
$9\frac{2}{3}$
1.5
$\frac{4}{21}$
8.1
1
$\frac{5}{6}$

2. 能简便的用简便方法计算。（12分）
$24×0.25×31$
$760-1040÷(704-688)$
$(\frac{5}{7}-\frac{1}{2})÷\frac{3}{10}×\frac{8}{25}$
$3.7×\frac{4}{5}+80\%×5.3+0.8$
$15.73-6.17+4.27-4.83$
$0.39÷[(\frac{1}{5}+2.4)÷\frac{2}{3}]$

186 695 $\frac{8}{35}$ 8 9 0.1

3. 求未知数x。(8分)
$\frac{3}{5}x - 19.2 = \frac{2}{5}x$
$3.2×2.5 - 75\%x = 4$
$\frac{x}{8} = \frac{4.5}{0.15}$
$\frac{3}{2}:0.4 = 1.35:x$

$x=96$ $x=\frac{16}{3}$ $x=240$ $x=0.36$