(1)直接写出得数。
$\frac{2}{9} × 6 = $
$\frac{6}{25} ÷ \frac{3}{5} = $
$\frac{4}{5} × \frac{3}{5} = $
$9 ÷ \frac{3}{10} = $
$\frac{8}{9} ÷ 4 = $
$8 ÷ 12 = $
$\frac{7}{9} ÷ \frac{1}{9} = $
$1 ÷ \frac{3}{4} = $
$\frac{3}{5} × \frac{3}{5} = $
$0 ÷ \frac{4}{15} = $
$\frac{3}{4} × 0.8 = $
$0.3 × \frac{3}{8} = $

$\frac{4}{3}$；$\frac{2}{5}$；$\frac{12}{25}$；30；$\frac{2}{9}$；$\frac{2}{3}$；7；$\frac{4}{3}$；$\frac{9}{25}$；0；0.6；$\frac{9}{80}$

(2)计算下面各题,怎样简便就怎样计算。
$\frac{1024}{1025} × 1026 = ______$
$\frac{4}{7} - \frac{2}{9} × \frac{4}{7} = ______$
$3.9 × \frac{7}{8} + 4.1 ÷ \frac{8}{7} = ______$
$(\frac{5}{6} - \frac{1}{4}) × 24 ÷ \frac{2}{3} = ______$

$\frac{1024}{1025} × 1026$
$=\frac{1024}{1025}×(1025 + 1)$
$=\frac{1024}{1025}×1025 + \frac{1024}{1025}×1$
$=1024 + \frac{1024}{1025}$
$=1024\frac{1024}{1025}$
$\frac{4}{7} - \frac{2}{9} × \frac{4}{7}$
$=\frac{4}{7}×(1 - \frac{2}{9})$
$=\frac{4}{7}×\frac{7}{9}$
$=\frac{4}{9}$
$3.9 × \frac{7}{8} + 4.1 ÷ \frac{8}{7}$
$=3.9×\frac{7}{8} + 4.1×\frac{7}{8}$
$=(3.9 + 4.1)×\frac{7}{8}$
$=8×\frac{7}{8}$
$=7$
$(\frac{5}{6} - \frac{1}{4}) × 24 ÷ \frac{2}{3}$
$=(\frac{5}{6}×24 - \frac{1}{4}×24)÷\frac{2}{3}$
$=(20 - 6)×\frac{3}{2}$
$=14×\frac{3}{2}$
$=21$
$1024\frac{1024}{1025}$；$\frac{4}{9}$；$7$；$21$

(3)解方程。
$\frac{3}{4}x ÷ \frac{1}{4} = \frac{3}{8}$______
$20\%x + \frac{2}{3}x = 26$______

$\frac{3}{4}x ÷ \frac{1}{4} = \frac{3}{8}$
解：$\frac{3}{4}x × 4 = \frac{3}{8}$
$3x = \frac{3}{8}$
$x = \frac{3}{8} ÷ 3$
$x = \frac{1}{8}$
$20\%x + \frac{2}{3}x = 26$
解：$\frac{1}{5}x + \frac{2}{3}x = 26$
$\frac{3}{15}x + \frac{10}{15}x = 26$
$\frac{13}{15}x = 26$
$x = 26 ÷ \frac{13}{15}$
$x = 30$