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1 将下列分数化简为最简分数。(每题1分,共10分)
$\frac {6}{18}= $ $\frac {26}{91}= $ $\frac {6}{24}= $ $\frac {15}{50}= $ $\frac {10}{24}= $
$\frac {52}{80}= $ $\frac {25}{35}= $ $\frac {18}{24}= $ $\frac {6}{9}= $ $\frac {12}{72}= $
$\frac {6}{18}= $ $\frac {26}{91}= $ $\frac {6}{24}= $ $\frac {15}{50}= $ $\frac {10}{24}= $
$\frac {52}{80}= $ $\frac {25}{35}= $ $\frac {18}{24}= $ $\frac {6}{9}= $ $\frac {12}{72}= $
答案
$\frac{1}{3}$ $\frac{2}{7}$ $\frac{1}{4}$ $\frac{3}{10}$ $\frac{5}{12}$
$\frac{13}{20}$ $\frac{5}{7}$ $\frac{3}{4}$ $\frac{2}{3}$ $\frac{1}{6}$
$\frac{13}{20}$ $\frac{5}{7}$ $\frac{3}{4}$ $\frac{2}{3}$ $\frac{1}{6}$
2 先将下面的分数约分,再把这些数按从大到小的顺序排列。(每空1分,共10分)
$\frac {45}{54}= ()$ $\frac {14}{42}= ()$ $\frac {4}{36}= ()$ $\frac {12}{63}= ()$ $\frac {9}{36}= ()$
$()＞ ()＞ ()＞ ()＞ ()$
$\frac {45}{54}= ()$ $\frac {14}{42}= ()$ $\frac {4}{36}= ()$ $\frac {12}{63}= ()$ $\frac {9}{36}= ()$
$()＞ ()＞ ()＞ ()＞ ()$
答案
$\frac{5}{6}$ $\frac{1}{3}$ $\frac{1}{9}$ $\frac{4}{21}$ $\frac{1}{4}$
$\frac{45}{54}$ $\frac{14}{42}$ $\frac{9}{36}$ $\frac{12}{63}$ $\frac{4}{36}$
$\frac{45}{54}$ $\frac{14}{42}$ $\frac{9}{36}$ $\frac{12}{63}$ $\frac{4}{36}$
3 计算下列各题,能简算的要简算。(每题3分,共18分)
$96.5÷1.25÷8$ $9.27-(3.5+1.27)$ $9.27×8.5+0.73×8.5$
$5.59-0.87-0.59$ $333×334+999×222$ $0.25×32×0.125$
$96.5÷1.25÷8$ $9.27-(3.5+1.27)$ $9.27×8.5+0.73×8.5$
$5.59-0.87-0.59$ $333×334+999×222$ $0.25×32×0.125$
答案
9.65 4.5 85
4.13 333000 1
4.13 333000 1
4 解方程。(每题4分,共12分)
$5.5x-1.3x= 12.6$ $1.3x+2.7x= 0.28$ $x÷4.8= 0.45$
$5.5x-1.3x= 12.6$ $1.3x+2.7x= 0.28$ $x÷4.8= 0.45$
答案
解：$x = 3$ 解：$x = 0.07$ 解：$x = 2.16$
