1. 直接写出得数。
$\frac{5}{64}×16=$ $\frac{3}{5}×25=$ $23×\frac{6}{23}=$ $11×\frac{9}{44}=$ $\frac{3}{8}×32=$ $19×\frac{3}{38}=$
$100×\frac{3}{10}=$ $\frac{4}{25}×100=$ $7×\frac{1}{91}=$ $\frac{4}{21}×5=$ $\frac{3}{14}×6=$ $\frac{7}{4}×8=$
$\frac{7}{8}×12=$ $18×\frac{5}{24}=$ $26×\frac{5}{39}=$ $25×\frac{3}{20}=$ $9×\frac{16}{15}=$ $6×\frac{13}{24}=$
$\frac{7}{12}×40=$ $44×\frac{4}{77}=$ $39×\frac{6}{13}=$ $72×\frac{23}{24}=$ $\frac{36}{49}×14=$ $\frac{23}{25}×15=$

1. $\dfrac{5}{4}$ 30 6 $\dfrac{9}{4}$ 12 $\dfrac{3}{2}$ 30 16 $\dfrac{1}{13}$ $\dfrac{20}{21}$ $\dfrac{9}{7}$ 14 $\dfrac{21}{2}$ $\dfrac{15}{4}$ $\dfrac{10}{3}$ $\dfrac{15}{4}$ $\dfrac{48}{5}$ $\dfrac{13}{4}$ $\dfrac{70}{3}$ $\dfrac{16}{7}$ 18 69 $\dfrac{72}{7}$ $\dfrac{69}{5}$

2. 解方程。
$3.2x - 1.4x = 36$ $1.2×6 + x = 10$ $x÷0.8 - 1.2 = 7.8$
$11.8 + 2x = 65.8$ $8x - 4x = 0.64$ $0.78x + 4 = 82$

2. $x=20$ $x=2.8$ $x=7.2$ $x=27$ $x=0.16$ $x=100$

(1) $\frac{1}{17},1,\frac{2}{17},\frac{1}{2},\frac{3}{17},\frac{1}{3},$(),()。
(2) $\frac{2}{5},11,\frac{4}{11},13,\frac{6}{17},15,$(),()。

思维提升
(1) $\dfrac{4}{17}$ $\dfrac{1}{4}$
(2) $\dfrac{8}{23}$ 17