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1, Rút gọn rồi tính
a) \(\frac{4}{5}+\frac{3}{15}\)
= \(\frac{4}{5}+\frac{1}{5}\)
= \(\frac{5}{5}\)
= \(1\)
b) \(\frac{2}{3}+\frac{32}{24}\)
= \(\frac{2}{3}+\frac{4}{3}\)
= \(\frac{6}{3}\)
= \(2\)
c) \(\frac{5}{6}+\frac{15}{18}\)
= \(\frac{5}{6}+\frac{5}{6}\)
= \(\frac{10}{6}\)
= \(\frac{5}{3}\)
2, Tính rồi rút gọn
a) \(\frac{8}{15}+\frac{2}{3}\)
= \(\frac{8}{15}+\frac{10}{15}\)
= \(\frac{18}{15}\)
= \(\frac{6}{5}\)
b) \(\frac{3}{7}+\frac{4}{8}\)
= \(\frac{24}{56}+\frac{28}{56}\)
= \(\frac{52}{56}\)
= \(\frac{13}{14}\)
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a: \(\dfrac{1}{8}+\dfrac{5}{8}=\dfrac{1+5}{8}=\dfrac{6}{8}=\dfrac{3}{4}\)
b: \(\dfrac{1}{15}+\dfrac{4}{15}=\dfrac{1+4}{15}=\dfrac{5}{15}=\dfrac{1}{3}\)
c: \(\dfrac{5}{9}+\dfrac{7}{9}=\dfrac{5+7}{9}=\dfrac{12}{9}=\dfrac{4}{3}\)
d: \(\dfrac{23}{100}+\dfrac{27}{100}=\dfrac{23+27}{100}=\dfrac{50}{100}=\dfrac{1}{2}\)
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rút gọn phân số :
4/5+21/15=4/5+7/5=11/5
8/9-25/45=8/9-5/9=3/9
tính :
5/6+2/7+15/6=5/6+15/6+2/7
=10/3+2/7=76/21
7/8-9/6.7/8=7/8-21/16=-7/16
chúc bạn học tốt !!!
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bài 5
a)
`7/5xx15/14`
`=105/70=3/2`
b)
`8/15xx25/8`
`=200/120=5/3`
c)
`2/15xx5/22`
`=10/330`
`=1/33`
bài 6
chiều rộng cx là đơn vị m phải ko ạ?
diện tích căn phòng là
`11/2xx7/2=77/4(m^2)`
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a, 5/10 - 2/15 = 1/2 - 2/15 = 15/30 - 4/30 = 11/30
b,5/20 - 1/6 = 1/4 - 1/6 = 3/12 - 2/12 = 1/12
c,6/18 - 6/24 = 1/3 - 1/4 = 4/12 - 3/12 = 1/12
d,5/9 - 3/12 = 5/9 - 1/4 = 20/36 - 9/36 = 11/36
chắc là đúng á , tại lớp 8 rồi ko nhớ lắm , mà vote mình nhá
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a, \(\frac{5}{16}+\frac{3}{8}=\frac{5}{16}+\frac{6}{16}=\frac{11}{16}\)
b, \(\frac{15}{25}+\frac{6}{21}=\frac{3}{5}+\frac{2}{7}\)
\(=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A) \(\dfrac{5}{10}\) - \(\dfrac{2}{15}\) = \(\dfrac{1}{2}\) -\(\dfrac{2}{15}\) =\(\dfrac{15}{30}\) -\(\dfrac{4}{30}\) =\(\dfrac{11}{30}\)
B)\(\dfrac{5}{20}\)-\(\dfrac{1}{6}\)=\(\dfrac{1}{4}\)-\(\dfrac{1}{6}\)=\(\dfrac{6}{24}\)-\(\dfrac{4}{24}\)=\(\dfrac{2}{24}\)=\(\dfrac{1}{12}\)
C)\(\dfrac{6}{18}\)-\(\dfrac{6}{24}\)=\(\dfrac{1}{3}\)-\(\dfrac{1}{4}\)=\(\dfrac{4}{12}\)-\(\dfrac{3}{12}\)=\(\dfrac{1}{12}\)
D)\(\dfrac{5}{9}\)-\(\dfrac{3}{12}\)=\(\dfrac{5}{9}\)-\(\dfrac{1}{4}\)=\(\dfrac{20}{36}\)-\(\dfrac{9}{36}\)=\(\dfrac{11}{36}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A) \(\frac{7}{8}-\frac{5}{12}=\frac{84}{96}-\frac{40}{96}=\frac{44}{96}=\frac{11}{24}\)
B)\(\frac{8}{15}-\frac{2}{5}=\frac{8}{15}-\frac{6}{15}=\frac{2}{15}\)
C)\(\frac{5}{6}-\frac{3}{10}=\frac{50}{60}-\frac{18}{60}=\frac{32}{60}=\frac{8}{15}\)
D)\(\frac{7}{10}-\frac{1}{5}=\frac{7}{10}-\frac{2}{10}=\frac{5}{10}=\frac{1}{2}\)
2)A)\(\frac{5}{10}-\frac{2}{15}=\frac{1}{2}-\frac{2}{15}=\frac{15}{30}-\frac{4}{30}=\frac{11}{30}\)
B)\(\frac{5}{20}-\frac{1}{6}=\frac{1}{4}-\frac{1}{6}=\frac{6}{24}-\frac{4}{24}=\frac{2}{24}=\frac{1}{12}\)
C)\(\frac{6}{18}-\frac{6}{24}=\frac{1}{3}-\frac{1}{4}=\frac{4}{12}-\frac{3}{12}=\frac{1}{12}\)
D)\(\frac{5}{9}-\frac{3}{12}=\frac{5}{9}-\frac{1}{4}=\frac{20}{36}-\frac{9}{36}=\frac{11}{36}\)
Chúc bạn học tốt
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mn ơi e vít nhầm là tính rồi rút gọn mn sửa lại là rút gọn rùi tính
bn ơi mk vít nhầm là tính rồi rút gọn bn sửa lại là rút gọn rùi tính
5/6 + 15/8 = 65/24
k nhé:))
5/6 + 15/8 = 65/24