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一、口算。
$93 + 99 =$
$3.14 - 0.75 =$
$0.88 + 2.22 =$
$\frac{7}{9} - \frac{1}{6} =$
$\frac{3}{16}×\frac{4}{9} =$
$\frac{2}{35}÷\frac{5}{14} =$
$\frac{7}{12}×\frac{13}{21} =$
$3.7×20\% =$
$0.85÷1.7 =$
$75\% - \frac{2}{3} =$
$\frac{1}{8} + \frac{1}{9} =$
$0.25×300 =$
$\frac{4}{5}÷\frac{3}{2} =$
$\frac{7}{8} - \frac{5}{6} =$
$2.63 + 3.7 =$
$8.1÷9\% =$
$\frac{5}{12} + \frac{1}{4} =$
$90\%×0.15 =$
$\frac{3}{2} - \frac{5}{8} =$
$4.8×5 =$
$9800÷140 =$
$93 + 99 =$
192
$3.14 - 0.75 =$
2.39
$0.88 + 2.22 =$
3.1
$\frac{7}{9} - \frac{1}{6} =$
$\dfrac{11}{18}$
$\frac{3}{16}×\frac{4}{9} =$
$\dfrac{1}{12}$
$\frac{2}{35}÷\frac{5}{14} =$
$\dfrac{4}{25}$
$\frac{7}{12}×\frac{13}{21} =$
$\dfrac{13}{36}$
$3.7×20\% =$
0.74
$0.85÷1.7 =$
0.5
$75\% - \frac{2}{3} =$
$\dfrac{1}{12}$
$\frac{1}{8} + \frac{1}{9} =$
$\dfrac{17}{72}$
$0.25×300 =$
75
$\frac{4}{5}÷\frac{3}{2} =$
$\dfrac{8}{15}$
$\frac{7}{8} - \frac{5}{6} =$
$\dfrac{1}{24}$
$2.63 + 3.7 =$
6.33
$8.1÷9\% =$
90
$\frac{5}{12} + \frac{1}{4} =$
$\dfrac{2}{3}$
$90\%×0.15 =$
0.135
$\frac{3}{2} - \frac{5}{8} =$
$\dfrac{7}{8}$
$4.8×5 =$
24
$9800÷140 =$
70
答案
一、192 2.39 3.1
$\dfrac{11}{18}$ $\dfrac{1}{12}$ $\dfrac{4}{25}$
$\dfrac{13}{36}$ 0.74 0.5
$\dfrac{1}{12}$ $\dfrac{17}{72}$ 75
$\dfrac{8}{15}$ $\dfrac{1}{24}$ 6.33
90 $\dfrac{2}{3}$ 0.135
$\dfrac{7}{8}$ 24 70
$\dfrac{11}{18}$ $\dfrac{1}{12}$ $\dfrac{4}{25}$
$\dfrac{13}{36}$ 0.74 0.5
$\dfrac{1}{12}$ $\dfrac{17}{72}$ 75
$\dfrac{8}{15}$ $\dfrac{1}{24}$ 6.33
90 $\dfrac{2}{3}$ 0.135
$\dfrac{7}{8}$ 24 70
二、计算下面各图形的表面积和体积。
答案
二、表面积：$10× 4+3.14× (10÷ 2{)}^{2}+3.14× 10× 4÷ 2=181.3(c{m}^{2})$
体积：$3.14× (10÷ 2{)}^{2}× 4÷ 2=157(c{m}^{3})$
表面积：$(2+1+2)× 2× 2+(2+1)× 2× 2+[(2+1+2)× 1+2× 1]× 2=46(c{m}^{2})$
体积:(2+1+2)×2×1+1×2×2=14($cm^{2}$)
体积：$3.14× (10÷ 2{)}^{2}× 4÷ 2=157(c{m}^{3})$
表面积：$(2+1+2)× 2× 2+(2+1)× 2× 2+[(2+1+2)× 1+2× 1]× 2=46(c{m}^{2})$
体积:(2+1+2)×2×1+1×2×2=14($cm^{2}$)
