1. 直接写出得数。
1.05 - 0.95 = 4 ÷ 0.8 = 5.5 ÷ 1.1 = 9.4 + 0.06 × 4 =
2.5 × 0.04 = 0.36 ÷ 3.6 = 8.3 - 0.9 = 0.6 + 4 ÷ 0.1 =
1.8 × 0.5 = 0.12 × 0.2 = 7.2 × 0.3 = 1.2m + 1.8m - 0.4m =
9 ÷ 0.45 = 8.92 - 3.36 = 0.87 ÷ 3 = 0.64 × 5 ÷ 2 =
3.98 ÷ 10 = 1.9 × 70 = 0.5 - 0.37 = 24 × 0.5 + 5.5 =
4.5 + 6.3 = 0 ÷ 1.65 = 5.33 + 1.77 = (0.6 + 3.04) ÷ 2 =
$ \frac{4}{25} + \frac{2}{5} = $$ \_\_\_\_\_\_ $$ \frac{4}{17} × 0 = $$ \_\_\_\_\_\_ $$ \frac{5}{8} - \frac{1}{6} = $$ \_\_\_\_\_\_ $$ \frac{4}{9} + \frac{1}{3} - \frac{1}{2} = $$ \_\_\_\_\_\_$$ \frac{5}{6}$ +$ \frac{5}{9} $= ______ $\frac{4}{7} $×$ \frac{2}{7}$ = ______ $\frac{1}{8}$ + $\frac{1}{5} $= ______$  \frac{1}{2} $+$ \frac{5}{8}$ +$ \frac{3}{4} $= ______

1. 0.1 5 5 9.64 0.1 0.1 7.4 40.6 0.9 0.024 2.16 2.6m 20 5.56 0.29 1.6 0.398 133 0.13 17.5 10.8 0 7.1 1.82 $\dfrac{14}{25}$ 0 $\dfrac{11}{24}$ $\dfrac{5}{18}$ $\dfrac{25}{18}$ $\dfrac{8}{49}$ $\dfrac{13}{40}$ $\dfrac{15}{8}$

2. 解方程。
$ x + 12.4 = 23.79 $$ \_\_\_\_\_\_ $$ 14(x - 1.6) = 4.9 $$ \_\_\_\_\_\_ $$ 9x + 2.5 × 8 = 22.7 $$ \_\_\_\_\_\_$ x - $\frac{7}{11} $= $\frac{3}{4} $______ 2 - x = $\frac{3}{5} $+ $\frac{11}{15}$  ______ x + ( $\frac{5}{6}$ -$ \frac{3}{5}$ ) =$ \frac{2}{5}$  ______

2. $x = 11.39$ $x = 1.95$ $x = 0.3$ $x = \dfrac{61}{44}$ $x = \dfrac{2}{3}$ $x = \dfrac{1}{6}$

有一列数：1，1，2，3，5，8，13，…从第3个数开始，每个数都是前面两个数的和。那么在前100个数中，有多少个奇数？

100÷3 = 33(组)……1(个)
2×33 + 1 = 67(个)
在前100个数中，有67个奇数。