so sánh phân số: a,-4/27 và -37/102 b,-14/35 và-26/65
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c) \(\dfrac{27}{26}\)và\(\dfrac{38}{37}\)
Ta có: \(\dfrac{27}{26}=1+\dfrac{1}{26}\); \(\dfrac{38}{37}=1+\dfrac{1}{37}\)
Vì \(\dfrac{1}{26}>\dfrac{1}{37}\) nên \(\dfrac{27}{26}>\dfrac{38}{37}\)
c: \(\dfrac{27}{26}-1=\dfrac{1}{26}\)
\(\dfrac{38}{37}-1=\dfrac{1}{37}\)
mà \(\dfrac{1}{26}>\dfrac{1}{37}\)
nên \(\dfrac{27}{26}>\dfrac{38}{37}\)
Ta có: \(\frac{27}{26}\)= \(\frac{27\times37}{26\times37}\)= \(\frac{999}{962}\).
\(\frac{38}{37}\)= \(\frac{38\times26}{37\times26}\)= \(\frac{988}{962}\).
Mà \(\frac{999}{962}\)> \(\frac{988}{962}\).
=> \(\frac{27}{26}\)> \(\frac{38}{37}\).
39/12>116/40
37/90>35/111
23/28<24/27
nha Nguyễn Thùy Linh
1.a) 3/4 > 5/10
b) 35/25 > 16/14
2.a) 7/5 > 5/7
b) 14/16 < 24/21
HT nha
( bạn t.i.c.k cho mik nha, mik cảm ơn )
\(\dfrac{26}{27}\) = 1 - \(\dfrac{1}{27}\)
\(\dfrac{14}{15}\) = 1 - \(\dfrac{1}{15}\)
Vì \(\dfrac{1}{27}\) < \(\dfrac{1}{15}\) nên \(\dfrac{26}{27}\) > \(\dfrac{14}{15}\)
Vì hai phân số phân số nào có phần bù nhỏ hơn thì phân số đó lớn hơn
Vậy \(\dfrac{26}{27}\) > \(\dfrac{14}{15}\)
a) Ta có: \(\dfrac{15}{7}>1\) (tử lớn hơn mẫu)
\(\dfrac{9}{14}< 1\) (tử nhỏ hơn mẫu)
Vậy: \(\dfrac{15}{7}>\dfrac{9}{14}\)
b) Ta có:
\(\dfrac{899}{900}=1-\dfrac{1}{900}\)
\(\dfrac{1235}{1236}=1-\dfrac{1}{1236}\)
Mà: \(\dfrac{1}{900}>\dfrac{1}{1236}\)
Vậy: \(\dfrac{1235}{1236}>\dfrac{899}{900}\)
c) Ta có:
\(\dfrac{77}{75}=1+\dfrac{2}{75}\)
\(\dfrac{37}{35}=1+\dfrac{2}{35}\)
Mà: \(\dfrac{2}{75}< \dfrac{2}{35}\)
Vậy: \(\dfrac{37}{35}>\dfrac{77}{75}\)
\(\left\{{}\begin{matrix}\dfrac{15}{7}=\dfrac{30}{14}\\\dfrac{9}{14}< \dfrac{30}{14}\end{matrix}\right.\Rightarrow\dfrac{15}{7}>\dfrac{9}{14}\)
\(\left\{{}\begin{matrix}\dfrac{899}{900}=\dfrac{899.1236}{900.1236}=\dfrac{\text{1111164}}{900.1236}\\\dfrac{1235}{1236}=\dfrac{1235.900}{900.1236}=\dfrac{\text{1111500}}{900.1236}>\dfrac{\text{1111164}}{900.1236}\end{matrix}\right.\Rightarrow\dfrac{1235}{1236}>\dfrac{899}{900}\)
\(\left\{{}\begin{matrix}\dfrac{77}{75}=\dfrac{539}{525}\\\dfrac{37}{35}=\dfrac{555}{525}>\dfrac{539}{525}\end{matrix}\right.\Rightarrow\dfrac{77}{73}< \dfrac{37}{35}\)
a) -4/27 = -136/918
-37/102 = -333/918
Mà: -136/918 > -333/918
=> -4/27 > -37/102
b) -14/35 = -2/5 = -26/65
Mà -26/65 = -26/65
=> -14/35 = -26/65