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一、口算。
1.75 - 0.31 =
$\frac{5}{8}×0.75=$
45 ÷ $\frac{3}{8}=$
12.6 ÷ 4 =
$\frac{7}{8}-\frac{7}{9}=$
$\frac{2}{9}÷\frac{8}{27}=$
$\frac{9}{14}×\frac{2}{21}=$
1.75 - 0.31 =
1.44
$\frac{1}{5}+\frac{7}{10}=$$\dfrac{9}{10}$
(3.2 + 5.8) ÷ 0.3 =30
$\frac{5}{8}×0.75=$
$\dfrac{15}{32}$
2890 + 1470 =4360
7.2 + 2.9 + 0.8 =10.9
45 ÷ $\frac{3}{8}=$
120
0.35 + 65% =1
$(\frac{3}{4}-\frac{3}{8})×\frac{3}{4}=$$\dfrac{9}{32}$
12.6 ÷ 4 =
3.15
$\frac{5}{9}×\frac{4}{15}=$$\dfrac{4}{27}$
$\frac{2}{5}-\frac{2}{5}×\frac{1}{5}=$$\dfrac{8}{25}$
$\frac{7}{8}-\frac{7}{9}=$
$\dfrac{7}{72}$
342 ÷ 3 =114
2.3 × 12.5 × 0.8 =23
$\frac{2}{9}÷\frac{8}{27}=$
$\dfrac{3}{4}$
$\frac{15}{16}×\frac{4}{5}=$$\dfrac{3}{4}$
$\frac{3}{7}×15÷\frac{3}{7}×15=$225
$\frac{9}{14}×\frac{2}{21}=$
$\dfrac{3}{49}$
85 + 58 =143
16.08 - 3.57 - 2.43 =10.08
答案
1.44 $\dfrac{9}{10}$ 30
$\dfrac{15}{32}$ 4360 10.9
120 1 $\dfrac{9}{32}$
3.15 $\dfrac{4}{27}$ $\dfrac{8}{25}$
$\dfrac{7}{72}$ 114 23
$\dfrac{3}{4}$ $\dfrac{3}{4}$ 225
$\dfrac{3}{49}$ 143 10.08
$\dfrac{15}{32}$ 4360 10.9
120 1 $\dfrac{9}{32}$
3.15 $\dfrac{4}{27}$ $\dfrac{8}{25}$
$\dfrac{7}{72}$ 114 23
$\dfrac{3}{4}$ $\dfrac{3}{4}$ 225
$\dfrac{3}{49}$ 143 10.08
二、计算下面各题，怎样简便就怎样计算。
52.5 - 4.24 - 15.76 68% × $\frac{4}{7}-\frac{4}{7}$×18% 13 × $(\frac{1}{13}+\frac{4}{15})×15$
(3.98 × 3 + 3.98) × 2.5 $\frac{1}{70}+\frac{2}{71}×22+\frac{27}{71}$ 86.4 ÷ [(2.49 + 3.51) × 0.6]
52.5 - 4.24 - 15.76 68% × $\frac{4}{7}-\frac{4}{7}$×18% 13 × $(\frac{1}{13}+\frac{4}{15})×15$
(3.98 × 3 + 3.98) × 2.5 $\frac{1}{70}+\frac{2}{71}×22+\frac{27}{71}$ 86.4 ÷ [(2.49 + 3.51) × 0.6]
答案
1.原式=52.5-(4.24+15.76)=32.5
$2.原式=\frac {4}{7}×(68\%-18\%)=\frac {2}{7}$
3.原式=15+52=67
4.原式=3.98×(4×2.5)=39.8
$5.原式=\frac {1}{70}+(\frac {44}{71}+\frac {27}{71})=1\frac {1}{70}$
6.原式=86.4÷6÷0.6=24
$2.原式=\frac {4}{7}×(68\%-18\%)=\frac {2}{7}$
3.原式=15+52=67
4.原式=3.98×(4×2.5)=39.8
$5.原式=\frac {1}{70}+(\frac {44}{71}+\frac {27}{71})=1\frac {1}{70}$
6.原式=86.4÷6÷0.6=24
