计算
(i) $\frac{7}{3}\div2$
(ii) $\frac{4}{9}\div5$
(iii) $\frac{6}{13}\div7$
(iv) $4\frac{1}{3}\div3$
(v) $3\frac{1}{2}\div4$
(vi) $4\frac{3}{7}\div7$
解题步骤
我们需要计算
(i) $\frac{7}{3}\div2$
(ii) $\frac{4}{9}\div5$
(iii) $\frac{6}{13}\div7$
(iv) $4\frac{1}{3}\div3$
(v) $3\frac{1}{2}\div4$
(vi) $4\frac{3}{7}\div7$
解答
我们知道:
$\frac{a}{b} \div \frac{c}{d}=\frac{a}{b}\times \frac{d}{c}$
因此:
(i) $\frac{7}{3}\div2=\frac{7}{3}\times\frac{1}{2}$
$=\frac{7\times1}{3\times2}$
$=\frac{7}{6}$
(ii) $\frac{4}{9}\div5=\frac{4}{9}\times\frac{1}{5}$
$=\frac{4\times1}{9\times5}$
$=\frac{4}{45}$
(iii) $\frac{6}{13}\div7=\frac{6}{13}\times\frac{1}{7}$
$=\frac{6\times1}{13\times7}$
$=\frac{6}{91}$
(iv) $4\frac{1}{3}\div3=\frac{4\times3+1}{3}\times\frac{1}{3}$
$=\frac{12+1}{3}\times\frac{1}{3}$
$=\frac{13}{3}\times\frac{1}{3}$
$=\frac{13\times1}{3\times3}$
$=\frac{13}{9}$
(v) $3\frac{1}{2}\div4$
(v) $3\frac{1}{2}\div4=\frac{3\times2+1}{2}\times\frac{1}{4}$
$=\frac{6+1}{2}\times\frac{1}{4}$
$=\frac{7}{2}\times\frac{1}{4}$
$=\frac{7\times1}{2\times4}$
$=\frac{7}{8}$
(vi) $4\frac{3}{7}\div7$
(vi) $4\frac{3}{7}\div7=\frac{4\times7+3}{7}\times\frac{1}{7}$
$=\frac{28+3}{7}\times\frac{1}{7}$
$=\frac{31}{7}\times\frac{1}{7}$
$=\frac{31\times1}{7\times7}$
$=\frac{31}{49}$
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