rút gọn 3600 - 8 phần 4500-10 1200 + 10 phần 1680 + 14
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1. 10 phần 14 = 5/7
2. 5 phần 15 = 1/3
3. 14 phần 22 = 7/11
4. 2 phần 8 = 1/4
5. 4 phần 24= 1/6
6. 2 phần 10 = 1/5
1. \(\frac{10}{14}=\frac{10:2}{14:2}=\frac{5}{7}\)
2. \(\frac{5}{15}=\frac{5:5}{15:5}=\frac{1}{3}\)
3. \(\frac{14}{22}=\frac{14:2}{22:2}=\frac{7}{11}\)
4. \(\frac{2}{8}=\frac{2:2}{8:2}=\frac{1}{4}\)
5. \(\frac{4}{24}=\frac{4:4}{24:4}=\frac{1}{6}\)
6. \(\frac{2}{10}=\frac{2:2}{10:2}=\frac{1}{5}\)
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\(\frac{7}{8}\div\left(\frac{14}{3}+\frac{14}{4}\right)+\frac{10}{14}\)
\(=\frac{7}{8}\div\left(\frac{56}{12}+\frac{52}{12}\right)+\frac{10}{14}\)
\(=\frac{7}{8}\div\frac{108}{12}+\frac{10}{14}\)
\(=\frac{7}{8}\div9+\frac{5}{7}\)
\(=\frac{7}{8}\times\frac{1}{9}+\frac{5}{7}\)
\(=\frac{7}{72}+\frac{5}{7}\)
\(=\frac{49}{504}+\frac{360}{504}\)
\(=\frac{409}{504}\)
\(\frac{30}{42}\div\left(\frac{5}{7}-\frac{5}{21}\right)+\frac{6}{8}\)
\(=\frac{6}{7}\div\left(\frac{15}{21}-\frac{5}{21}\right)+\frac{3}{4}\)
\(=\frac{6}{7}\div\frac{10}{21}+\frac{3}{4}\)
\(=\frac{6}{7}\times\frac{21}{10}+\frac{3}{4}\)
\(=\frac{126}{70}+\frac{3}{4}\)
\(=\frac{504}{280}+\frac{210}{280}\)
\(=\frac{714}{280}\)
\(\left(6-\frac{14}{15}\right).\frac{50}{38}-\frac{8}{18}\)
\(=\left(\frac{90}{15}-\frac{14}{15}\right).\frac{25}{19}-\frac{4}{9}\)
\(=\frac{76}{15}.\frac{25}{19}-\frac{4}{9}\)
\(=\frac{76.25}{15.19}-\frac{4}{9}\)
\(=\frac{19.2.2.5.5}{3.5.19}-\frac{4}{9}\)
\(=\frac{20}{3}-\frac{4}{9}\)
\(=\frac{60}{9}-\frac{4}{9}\)
\(=\frac{56}{9}\)
\(\frac{4}{6}+\frac{5}{21}.\left(\frac{4}{5}-\frac{2}{6}\right)\)
\(=\frac{2}{3}+\frac{5}{21}.\left(\frac{24}{30}-\frac{10}{30}\right)\)
\(=\frac{2}{3}+\frac{5}{21}.\frac{14}{30}\)
\(=\frac{2}{3}+\frac{70}{630}\)
\(=\frac{420}{630}+\frac{70}{630}\)
\(=\frac{490}{630}\)
\(=\frac{7}{9}\)
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a, \(\dfrac{990}{2610}=\dfrac{11}{29}\)
b) \(\dfrac{3600-75}{8400-175}=\dfrac{3}{7}\)
c) \(\dfrac{9^{14}\cdot25^5\cdot8^7}{18^{12}\cdot625^5\cdot24^3}=\dfrac{3}{25}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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Đây sở trường của tui
4 /6=2/3
12/8 = 3/2
15/25 =3/5
11/22=1/2
36/10 =18/5
75/36=25/12
NHỚ TÍCH NHA BẠN VÌ CHÚNG TA ĐỀU LÀ PHỤ NỮ
Lệ quyên : v~ cả sở trường làm như chỉ mình mày biết làm ý
giúp tôi với làm ơn
\(\dfrac{3600-8}{4500-10}\)=\(\dfrac{3592}{4490}\)=\(\dfrac{898\cdot4}{898\cdot5}\)=\(\dfrac{4}{5}\)