1. 直接写出得数。
实际用时:分钟
$\frac{2}{3}+\frac{1}{6}=$ $\frac{1}{2}-\frac{1}{5}=$ $\frac{9}{10}×\frac{5}{3}=$ $\frac{15}{14}÷\frac{15}{7}=$
$\frac{7}{10}+\frac{1}{2}=$ $\frac{7}{15}-\frac{1}{3}=$ $0.15×\frac{2}{5}=$ $\frac{10}{23}÷\frac{2}{23}=$
$\frac{2}{7}+\frac{4}{7}=$ $\frac{7}{8}-\frac{2}{5}=$ $\frac{4}{5}×\frac{2}{7}=$ $14÷\frac{7}{5}=$
$\frac{5}{12}+\frac{1}{3}=$ $1-\frac{1}{11}=$ $\frac{7}{15}×30=$ $\frac{3}{5}÷0.6=$
$\frac{2}{15}+\frac{1}{3}=$ $\frac{7}{16}-\frac{3}{8}=$ $3.5×\frac{3}{7}=$ $\frac{15}{14}÷5=$
$\frac{5}{9}+\frac{1}{6}=$ $\frac{1}{2}-\frac{5}{18}=$ $\frac{3}{10}×\frac{3}{2}=$ $3.6÷\frac{9}{5}=$
实际用时:分钟
$\frac{2}{3}+\frac{1}{6}=$ $\frac{1}{2}-\frac{1}{5}=$ $\frac{9}{10}×\frac{5}{3}=$ $\frac{15}{14}÷\frac{15}{7}=$
$\frac{7}{10}+\frac{1}{2}=$ $\frac{7}{15}-\frac{1}{3}=$ $0.15×\frac{2}{5}=$ $\frac{10}{23}÷\frac{2}{23}=$
$\frac{2}{7}+\frac{4}{7}=$ $\frac{7}{8}-\frac{2}{5}=$ $\frac{4}{5}×\frac{2}{7}=$ $14÷\frac{7}{5}=$
$\frac{5}{12}+\frac{1}{3}=$ $1-\frac{1}{11}=$ $\frac{7}{15}×30=$ $\frac{3}{5}÷0.6=$
$\frac{2}{15}+\frac{1}{3}=$ $\frac{7}{16}-\frac{3}{8}=$ $3.5×\frac{3}{7}=$ $\frac{15}{14}÷5=$
$\frac{5}{9}+\frac{1}{6}=$ $\frac{1}{2}-\frac{5}{18}=$ $\frac{3}{10}×\frac{3}{2}=$ $3.6÷\frac{9}{5}=$
答案
1. $\frac{5}{6}$ $\frac{3}{10}$ $\frac{3}{2}$ $\frac{1}{2}$
$\frac{6}{5}$ $\frac{2}{15}$ $\frac{3}{50}$ $5$
$\frac{6}{7}$ $\frac{19}{40}$ $\frac{8}{35}$ $10$
$\frac{3}{4}$ $\frac{10}{11}$ $14$ $1$
$\frac{7}{15}$ $\frac{1}{16}$ $\frac{3}{2}$ $\frac{3}{14}$
$\frac{13}{18}$ $\frac{2}{9}$ $\frac{9}{20}$ $2$
$\frac{6}{5}$ $\frac{2}{15}$ $\frac{3}{50}$ $5$
$\frac{6}{7}$ $\frac{19}{40}$ $\frac{8}{35}$ $10$
$\frac{3}{4}$ $\frac{10}{11}$ $14$ $1$
$\frac{7}{15}$ $\frac{1}{16}$ $\frac{3}{2}$ $\frac{3}{14}$
$\frac{13}{18}$ $\frac{2}{9}$ $\frac{9}{20}$ $2$
2. 计算下面各题。
$16×(\dfrac{5}{8}-\dfrac{1}{4})$
$\dfrac{3}{5}×\dfrac{10}{17}+\dfrac{14}{5}×\dfrac{10}{17}$
$(\dfrac{1}{6}+\dfrac{2}{3})×25$
$16×(\dfrac{5}{8}-\dfrac{1}{4})$
$\dfrac{3}{5}×\dfrac{10}{17}+\dfrac{14}{5}×\dfrac{10}{17}$
$(\dfrac{1}{6}+\dfrac{2}{3})×25$
答案
2. $6$ $2$ $\frac{125}{6}$
3. 先计算,再将算式按得数从大到小的顺序排一排(填序号)。
①$4×(1+\dfrac{1}{2})=$
②$16-\dfrac{3}{4}×16=$
③$6+6×\dfrac{2}{3}=$
④$25-\dfrac{2}{5}×25=$
$(\quad)>(\quad)>(\quad)>(\quad)$
①$4×(1+\dfrac{1}{2})=$
②$16-\dfrac{3}{4}×16=$
③$6+6×\dfrac{2}{3}=$
④$25-\dfrac{2}{5}×25=$
$(\quad)>(\quad)>(\quad)>(\quad)$
答案
3. ①$6$ ②$4$ ③$10$ ④$15$
$④>③>①>②$
$④>③>①>②$
定义一种新运算“△”:$8△3=8+9+10=27$,$7△4=7+8+9+10=34$,$6△5=6+7+8+9+10=40$,那么$1△10$的值是多少?
答案
【思维提升】55
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