17018 : 67 = ?
17822 : 38 = ?
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Bài 1:
17018 : 67 = 254
17822 : 38 = 469
Bài 2:
\(\frac{5}{3}+\frac{3}{5}=\frac{25}{15}+\frac{9}{15}=\frac{34}{12}\)
\(\frac{1}{2}+5=\frac{1}{2}+\frac{5}{1}=\frac{1}{2}+\frac{10}{2}=\frac{11}{2}\)
\(3:\frac{3}{7}=\frac{3}{1}:\frac{3}{7}=\frac{3}{1}.\frac{7}{3}=\frac{21}{3}=7\)
\(5-\frac{6}{9}=\frac{5}{1}-\frac{6}{9}=\frac{45}{9}-\frac{6}{9}=\frac{39}{9}\)
\(4.\frac{2}{7}=\frac{8}{7}\)
Bài 3:
Bài giải
Trung bình cộng của các số đó là:
(28 + 44 + 65 + 36 + 73 + 42) : 6 = 48
Đáp số: 48
Hướng dẫn giải:
a) 93 + 39 + 7 = (93 + 7) + 39 = 100 + 39 = 139.
89 + 85 + 11 = (89 + 11) + 85 = 100 + 85 = 185
184 + 66 + 16 = (184 + 16) + 66 = 200 + 66 = 266
b) 23 + 52 + 47 + 98 = (23 + 47) + (52 + 98) = 70 + 150 = 220
16 + 490 + 84 + 10 = (16 + 84) + (490 + 10) = 100 + 500 = 600
35 + 67 + 67 + 98 + 27 + 89 + 38 + 19 + 56 + 19 + 17 = 532
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{38}\\{52}\end{array}}\\\hline{\,\,\,90}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{15}\\{15}\end{array}}\\\hline{\,\,\,30}\end{array}\)
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{67}\\{17}\end{array}}\\\hline{\,\,\,84}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{72}\\{19}\end{array}}\\\hline{\,\,\,91}\end{array}\)
15/19.38/5<x<67/15+53/15
=>3/1.2/1<x<120/15
=>6<x<8
=>x=7
h gium nha
a) 57 + 28 = 85
24 + 67 = 91
46 + 39 = 85
b) 83 - 19 = 64
42 - 38 = 4
90 - 76 = 14
\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{57}\\{28}\end{array}}\\\hline{\,\,\,\,85}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{24}\\{67}\end{array}}\\\hline{\,\,\,\,91}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{39}\end{array}}\\\hline{\,\,\,\,85}\end{array}\)
\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{83}\\{19}\end{array}}\\\hline{\,\,\,\,64}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{42}\\{38}\end{array}}\\\hline{\,\,\,\,04}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{90}\\{76}\end{array}}\\\hline{\,\,\,\,14}\end{array}\)
17018 : 67 = 254
17822 : 38 = 469
Tk mk nha
17018 : 67 = 254
17822 : 38 = 469