計算 $\frac{4}{11}$×$\frac{5}{6}$×33 | $\frac{5}{12}$×36×$\frac{2}{3}$ | $\frac{7}{11}$×$\frac{2}{3}$×$\frac{3}{14}$ | 15×$\frac{8}{9}$×$\frac{3}{10}$ | $\frac{1}{3}$×$\frac{5}{8}$×$\frac{4}{5}$ |
$\frac{2}{9}$×$\frac{3}{20}$×18 | $\frac{7}{12}$×$\frac{60}{11}$×44 | $\frac{9}{8}$×$\frac{4}{5}$×$\frac{35}{27}$ | 60×$\frac{51}{38}$×$\frac{57}{34}$. |
分析 (1)(8)根據(jù)乘法交換律結(jié)合律簡算;
(2)把36分成12×3,再根據(jù)乘法結(jié)合律簡算;
(3)(4)(5)(7)根據(jù)乘法結(jié)合律簡算;
(6)把19分成2×9,再根據(jù)乘法結(jié)合律簡算;
(9)根據(jù)乘法結(jié)合律約分即可.
解答 解:(1)$\frac{4}{11}$×$\frac{5}{6}$×33
=($\frac{4}{11}$×33)×$\frac{5}{6}$
=12×$\frac{5}{6}$
=10
(2)$\frac{5}{12}$×36×$\frac{2}{3}$
=$\frac{5}{12}$×12×3×$\frac{2}{3}$
=5×2
=10
(3)$\frac{7}{11}$×$\frac{2}{3}$×$\frac{3}{14}$
=$\frac{7}{11}$×($\frac{2}{3}$×$\frac{3}{14}$)
=$\frac{7}{11}$×$\frac{1}{7}$
=$\frac{1}{11}$
(4)15×$\frac{8}{9}$×$\frac{3}{10}$
=15×($\frac{8}{9}$×$\frac{3}{10}$)
=15×$\frac{4}{15}$
=4
(5)$\frac{1}{3}$×$\frac{5}{8}$×$\frac{4}{5}$
=$\frac{1}{3}$×($\frac{5}{8}$×$\frac{4}{5}$)
=$\frac{1}{3}$×$\frac{1}{2}$
=$\frac{1}{6}$
(6)$\frac{2}{9}$×$\frac{3}{20}$×18
=$\frac{2}{9}$×9×2×$\frac{3}{20}$
=2×$\frac{3}{10}$
=$\frac{3}{5}$
(7)$\frac{7}{12}$×$\frac{60}{11}$×44
=$\frac{7}{12}$×($\frac{60}{11}$×44)
=$\frac{7}{12}$×240
=140
(8)$\frac{9}{8}$×$\frac{4}{5}$×$\frac{35}{27}$
=($\frac{9}{8}$×$\frac{35}{27}$)×$\frac{4}{5}$
=$\frac{25}{24}$×$\frac{4}{5}$
=$\frac{5}{6}$
(9)60×$\frac{51}{38}$×$\frac{57}{34}$
=30×$\frac{51}{19}$×$\frac{57}{34}$
=15×$\frac{51}{19}$×$\frac{57}{17}$
=15×3×3
=15×9
=135
點評 完成本題要注意細心分析式中數(shù)據(jù),然后快速準確得出答案.
科目:小學數(shù)學 來源: 題型:填空題
查看答案和解析>>
科目:小學數(shù)學 來源: 題型:解答題
查看答案和解析>>
科目:小學數(shù)學 來源: 題型:解答題
90 | 84 | 98 | 100 | 82 | 59 | 89 | 70 | 85 | 79 |
97 | 88 | 87 | 99 | 81 | 85 | 75 | 92 | 78 | 82 |
91 | 94 | 76 | 69 | 95 | 65 | 86 | 66 | 83 | 98 |
分數(shù)/分 | 人數(shù) |
90~100 | |
80~89 | |
70~79 | |
70以下 |
分數(shù)/分 | 合計 | 90~100 | 80~89 | 70~79 | 70以下 |
人數(shù) |
查看答案和解析>>
湖北省互聯(lián)網(wǎng)違法和不良信息舉報平臺 | 網(wǎng)上有害信息舉報專區(qū) | 電信詐騙舉報專區(qū) | 涉歷史虛無主義有害信息舉報專區(qū) | 涉企侵權(quán)舉報專區(qū)
違法和不良信息舉報電話:027-86699610 舉報郵箱:58377363@163.com