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a: 7/8<8/9<9/10<10/11<11/12
b: 4/5<5/6<6/7<7/8
c: 1/3<3/5<7/9<9/11<11/13
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Tính :
a) \(\frac{6}{7}+\frac{12}{5}:\frac{8}{7}=\frac{6}{7}+\frac{21}{10}=\frac{60}{70}+\frac{147}{70}=\frac{207}{70}\)
b) \(\frac{24}{7}\)- \(\frac{5}{8}\)x \(2\)= \(\frac{24}{7}-\frac{5}{4}=\frac{96}{28}-\frac{35}{28}=\frac{61}{28}\)
=6/7+(12.7)/(5.8)=6/7+(3.7)/(5.2)=6/7+21/10=(60+21*7)/70=207/70
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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12
= ( 1 + 12 ) + ( 2 + 11 ) + ( 3 + 10 ) + ( 4 + 9 ) + ( 5 + 8 ) + ( 6 + 7 )
= 13 + 13 + 13 + 13 + 13 + 13
= 13 x 6
= 78
sai thui
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2/3 = 2 x 4/ 3 x 4 =8/12
8/14 = 8 : 2/ 14 : 2 =4/7
5/9 = 5 x3/ 9 x 3 =15/37
35/ 40 = 35 : 5/ 40 : 5=7/8
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mk làm phần c trc nhé bn vì phần a,b thấy số cũng to nên làm dễ trc:
\(\frac{5\times6\times7}{12\times14\times15}=\frac{5\times6\times7}{12\times7\times2\times5\times3}=\frac{6}{72}=\frac{1}{6}\)
Bn gạch cho mk : hai số 7, hai số 5 nha.Vì mk ko biết gạch số nên bảo bn vậy mog bn hỉu.
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a)
`7/12+3/4xx2/9`
`=7/12+1/6`
`=7/12+2/12`
`=9/12`
`=3/4`
b)
`8/9-4/15:2/5`
`=8/9-4/15xx5/2`
`=8/9-2/3`
`=8/9-6/9`
`=2/9`
14/8 x 12/7 - 3/8 x 5/9
=1/8 x 14 x 12/7 - 1/8 x 3 x 5/9
= 1/8 x 24 - 1/8 x 5/3
= 3 - 5/24
=72/24 - 5/24
= 67/24
\(\dfrac{14}{8}:\dfrac{7}{12}-\dfrac{3}{8}:\dfrac{9}{5}=\dfrac{14}{8}\) x \(\dfrac{12}{7}-\dfrac{3}{8}\) x \(\dfrac{5}{9}=3-\dfrac{5}{24}=\dfrac{3}{1}-\dfrac{5}{24}=\dfrac{72}{24}-\dfrac{5}{24}=\dfrac{67}{24}\)