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第19页

信息发布者：

$4.4$

$5$

$0.09$

7.2

$\dfrac{13}{20}$

$\dfrac{1}{30}$

$\dfrac{1}{6}$

$\dfrac{27}{16}$

 $\begin{aligned}&\dfrac{3}{8}×[\dfrac{8}{9}÷(\dfrac{5}{6}-\dfrac{3}{4})]\\=&\dfrac{3}{8}×[\dfrac{8}{9}÷\dfrac{1}{12}]\\=&\dfrac{3}{8}×\dfrac{32}{3}\\=&4\end{aligned}$

 $\begin{aligned}&\dfrac{7}{20}×99+7÷20\\=&\dfrac{7}{20}×99+\dfrac{7}{20}\\=&\dfrac{7}{20}×(99+1)\\=&\dfrac{7}{20}×100\\=&35\end{aligned}$

 $\begin{aligned}&7.6-\dfrac{4}{15}-\dfrac{11}{15}\\=&7.6-(\dfrac{4}{15}+\dfrac{11}{15})\\=&7.6-1\\=&6.6\end{aligned}$

 $\begin{aligned}解：\dfrac{3}{4}x&=30\%×10\\\dfrac{3}{4}x&=3\\x&=3÷\dfrac{3}{4}\\x&=4\end{aligned}$

 $\begin{aligned}解：x-\dfrac{4}{9}x&=\dfrac{10}{21}\\\dfrac{5}{9}x&=\dfrac{10}{21}\\x&=\dfrac{10}{21}÷\dfrac{5}{9}\\x&=\dfrac{6}{7}\end{aligned}$

 $\begin{aligned}解：1.3x-0.4×3&=1.4\\1.3x-1.2&=1.4\\1.3x&=2.6\\x&=2\end{aligned}$