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a. \(\frac{3}{4}>\frac{2}{4}\)
b. \(\frac{3}{8}< \frac{7}{8}\)
c . \(\frac{8}{10}< \frac{9}{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
quy đồng:
8/9=8x7/9x7=56/63 ; 6/7=6x9/7x9=54/63
so sánh:
56/63 > 54/63 nên 8/9 > 6/7
tick nha
Quy đồng
\(\frac{8}{9}=\frac{8x7}{9x7}=\frac{56}{63}\), \(\frac{6}{7}=\frac{6x9}{7x9}=\frac{54}{63}\)
So sánh:
\(\frac{56}{63}>\frac{54}{63}\)nên \(\frac{8}{9}>\frac{6}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
d-c=7⇒d=7+c=7+8=15
\(\Rightarrow\dfrac{c}{d}=\dfrac{8}{15}\)
b-2=a⇒b=a+2=7+2=9
\(\Rightarrow\dfrac{a}{b}=\dfrac{7}{9}\)
Ta có: \(\dfrac{8}{15}=\dfrac{8\times3}{15\times3}=\dfrac{24}{45}\)
\(\dfrac{7}{9}=\dfrac{7\times5}{9\times5}=\dfrac{35}{45}\)
Vì \(\dfrac{24}{45}< \dfrac{35}{45}\Rightarrow\dfrac{c}{d}< \dfrac{a}{b}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a] 4/12 ; 5/12 ; 11/2 ; 1/4
b] 1 ; 9/12; 12/5 ; 11/3
c] 8/21; 6/11;8/7
d] 2/3 ;2/7 15/2
a]1/3 5/12 11/2 1/4
b]1 3/4 12/5 33/9
c]8/21 6/11 8/7
d]2/3 2/7 15/2
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1 phần D
Bài 2:
\(\frac{1}{4}\)x\(\frac{5}{3}\):\(\frac{2}{7}\)
= \(\frac{5}{12}\): \(\frac{2}{7}\)
=\(\frac{35}{24}\)
k mình nhá, thanks !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{7}{8}\)- y = \(\frac{1}{2}\)+ \(\frac{1}{8}\)
\(\frac{7}{8}\)- y = \(\frac{5}{8}\)
y = \(\frac{7}{8}\)- \(\frac{5}{8}\)
y = \(\frac{1}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5\times7\times8\times9\times10}{7\times8\times9\times10\times11}=\frac{5\times̸7\times̸8\times̸9\times̸10}{̸7\times̸8\times̸9\times̸10\times11}=\frac{5}{11}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
12/20 và 22/25
Ta có :
\(\frac{12}{20}=\frac{12\times5}{20\times5}=\frac{60}{100}\)
\(\frac{22}{25}=\frac{22\times4}{25\times4}=\frac{88}{100}\)
Ta thấy : 60/100 < 88/100
nên 12/20 < 22/25
tk nha
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1+2+3 .............100=100.{100+1}:2=5050
tick cho chj nhà cường....r chi tick lai cho em
7/8<8/7 nha bạn
TL
VÌ 7/8<1
8/7>1
VẬY 7/8<8/7
HT