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a,1/5+4/11+4/5+7/11
=(1/5+4/5)+(4/11+7/11)
=1+1
=2
Chọn B
1367.54+1367.45+1367
=1367.(54+45+1)
=1367.100
=136700
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =11/4+5/4-9/8
=4-9/8=32/8-9/8=23/8
b: \(=\dfrac{6}{7}\cdot\dfrac{7}{4}+\dfrac{5}{3}=\dfrac{3}{2}+\dfrac{5}{3}=\dfrac{9+10}{6}=\dfrac{19}{6}\)
c: \(=\dfrac{13}{18}\cdot\dfrac{9}{5}-1=\dfrac{13}{10}-1=\dfrac{3}{10}\)
d: \(=3+\dfrac{9}{4}\cdot\dfrac{5}{3}=3+\dfrac{45}{12}=\dfrac{81}{12}=\dfrac{27}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
10/11+9/10 = 199/110
15/30+7/30 = 11/15
1/2+1/3 = 5/6
3/5+11/15 = 4/3
3/4+1/6 = 11/12
5/11+4/11 = 9/11
BẠN THẬT XUẤT SẮC
CẢM ƠN BẠN NHA
CHÚC BAN CUỐI TUẦN VUI VẺ
![](https://rs.olm.vn/images/avt/0.png?1311)
cách 1:
\(\frac{8}{15}:\frac{2}{11}+\frac{7}{15}:\frac{2}{11}=\frac{8}{15}.\frac{11}{2}+\frac{7}{15}.\frac{11}{2}=\frac{11}{2}\left(\frac{8}{15}+\frac{7}{15}\right)=\frac{11}{2}.1=\frac{11}{2}\)
cách 2:
\(\frac{8}{15}:\frac{2}{11}+\frac{7}{15}:\frac{2}{11}=\frac{44}{15}+\frac{77}{30}=\frac{11}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`3/7 xx 1/9 + 3/7 xx 8/9`
`= 3/7 xx (1/9 +8/9)`
`= 3/7 xx 9/9`
`= 3/7 xx 1`
`=3/7`
`3/7xx1/9+3/7xx8/9`
`=3/7xx(1/9+8/9)`
`=3/7xx9/9`
`=3/7xx1`
`=3/7`
![](https://rs.olm.vn/images/avt/0.png?1311)
15+15*2+7*15-100=15*1+15*2+7*15-100
=15*(1+2+7)-100
=15*10-100
=150-100
=50
![](https://rs.olm.vn/images/avt/0.png?1311)
5/11.5/7+2/7.5/11
=5/11.(5/7+2/7)
=5/11
15 x 7/15 x 4/9
=7 x 4/9
=28/9
3 + 7 + 11 + 15 + 19
= (3 + 7) + ( 11 +19) + 15
= 10 + 30 + 15
= 40+15
=55
3+7+11+15+19
=( 3+7)+( 11+19)+15
=10+20+15
=30+15
=45
k cho mik nha các bạn