So sánh phân số sau :

\(\frac{474747}{383838}< \frac{123123}{246246}\)

Cách làm : Rút gọn các phân số 

ủng hộ tớ nha. thank you ☺

Rút gọn cả 2 phân số:

\(\frac{474747}{383838}=\frac{474747:10101}{383838:10101}=\frac{47}{38};\frac{123123}{246246}=\frac{123123:123123}{246246:123123}=\frac{1}{2}\)

Vậy có 2 phân số tối giản, lại có luôn mẫu chung. Bạn quy đồng lên và so sánh.

\(\dfrac{373737}{474747}+\dfrac{5757}{4747}\) 

\(\left(=\dfrac{373737:10101}{474747:10101}+\dfrac{5757:101}{4747:101}\right)\)

\(=\dfrac{37}{47}+\dfrac{57}{47}=\dfrac{37+57}{47}=\dfrac{94}{47}=2\)

toán lớp 5 nâng cao  à?

Số kiểu này thì sao mà làm được bạn

A=37/47+57/47

A=94/47
 

A = 373737/474747 + 5757/4747

A = 379494/479494

A = 2

373737:474747+5757:4747

=37/47                +   57/47

=      94/47

\(=\frac{373737}{474747}+\frac{5757}{4747}\)

\(=\frac{37}{47}+\frac{57}{47}\)

\(=\frac{94}{47}\)

\(\dfrac{212121}{232323}=\dfrac{212121:10101}{232323:10101}=\dfrac{21}{23}\)

\(\dfrac{123123}{124124}=\dfrac{123123:1001}{124124:1001}=\dfrac{123}{124}\)

Ta có: \(1-\dfrac{21}{23}=\dfrac{2}{23}\) ; \(1-\dfrac{123}{124}=\dfrac{1}{124}=\dfrac{2}{248}\)

\(=>\dfrac{2}{23}>\dfrac{2}{248}\)

\(=>1-\dfrac{21}{23}>1-\dfrac{123}{124}\)

\(=>\dfrac{21}{23}< \dfrac{123}{124}\)

\(=>\dfrac{212121}{232323}< \dfrac{123123}{124124}\)

what?

\(\frac{373737}{474747}+\frac{5757}{4747}\)

\(=\frac{373737\div10101}{474747\div10101}+\frac{5757\div101}{4747\div101}\)

\(=\frac{37}{47}+\frac{57}{47}\)

\(=\frac{94}{47}\)\(=2\)

Học tốt~

 373737 / 474747+ 5757 / 4747

=37/47                +   57/47

=      94/47

 373737 /474747 + 5757 / 4747

=\(\left(37\cdot10101\right):\left(47\cdot10101\right)\left(57\cdot101\right):\left(47\cdot101\right)\)

\(\left(37-47\right)\cdot10101+\left(57-47\right)\cdot101\)

373737 / 474747+ 5757 / 4747

=37/47                +   57/47

=      94/47