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Bài 7:

$\textit{a}$$\text{) $\dfrac{12}{11}$ > $\dfrac{12}{17}$}$

$\textit{b}$$\text{) $\dfrac{5}{8}$ = $\dfrac{25}{40}$}$

$\textit{c}$$\text{) $\dfrac{3}{4}$ < $\dfrac{6}{7}$}$

$\textit{d}$$\text{) $\dfrac{5}{6}$ > $\dfrac{7}{9}$}$

Bài 8:

$\textit{a}$$\text{) 4 $\textit{tạ}$ = 4000 $\textit{kg}$}$

$\Rightarrow$ $\textit{S}$

$\textit{b}$$\text{) 63 000 $\textit{kg}$ = 63 $\textit{tấn}$}$

$\Rightarrow$ $\textit{Đ}$

$\textit{c}$$\text{) 4 $cm^{2}$ 7 $dm^{2}$ = 407 $dm^{2}$ }$

$\Rightarrow$ $\textit{Đ}$

$\textit{d}$$\text{) 23 000 $cm^{2}$ = 230 $m^{2}$ }$

$\Rightarrow$ $\textit{S}$