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Hương Giang Nguyễn
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❄Người_Cao_Tuổi❄
6 tháng 5 2022 lúc 18:28

1,

a,=4/7:4/9.3

=9/7.3

=27/7

b,=(7/11+4/11).5/6

=1.5/6

=5/6

2611
6 tháng 5 2022 lúc 18:29

`(6/7-2/7):4/9xx3=4/7xx9/4xx3=[4xx9xx3]/[7xx4]=27/7`

`7/11xx5/6+4/11xx5/6=(7/11+4/11)xx5/6=11/11xx5/6=5/6`

Hoàng Ngân Hà
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Vũ Quang Huy
14 tháng 4 2022 lúc 22:22

9/5 + 4/7 + 6/5 + 3/7

=  ( 9/5 + 6/5 ) + ( 4/7 + 3/7)

=            3        + 1

=        4

 

Khoa Multi
14 tháng 4 2022 lúc 22:23

9/5 + 4/7 + 6/5 + 3/7 = (9/5 + 6/5) + (4/7 + 3/7)

= 15/5 + 7/7

= 3 + 1

= 4

1/2 x 45/33 x 1/9 x 11/6 = (1/2 x 1/9) x (45/33 x 11/6)

= 1/18 x 45/18

= 5/2

Vũ Quang Huy
14 tháng 4 2022 lúc 22:23

1/2 x 45/33 x 1/9 x 11/6

= (1/2 x 1/9) x (45/33 x 11/6)

= 1/18 x 45/18

= 5/2

Bùi Linh Huệ
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Xem chi tiết

a, = \(\frac{11}{21}\)\(\left(\frac{7}{4}+\frac{5}{4}\right)\)

   = \(\frac{11}{21}\)x 3

  = \(\frac{33}{21}\)

b) = \(\left(\frac{23}{14}-\frac{9}{14}\right)\)\(\frac{6}{13}\)

    = 1 x \(\frac{6}{13}\)

    = \(\frac{6}{13}\)

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Nguyễn Ngọc Huyền
21 tháng 5 2021 lúc 16:34

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Nguyễn Thành Nam
31 tháng 8 2021 lúc 9:01

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Nguyễn Nhật Linh Anh
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Thanh Mai
26 tháng 2 2022 lúc 20:59

2/5+11/9+3/5+7/9= (2/5+3/5)+(11/9+7/9)                             = 1+2                             = 3

 

Nguyễn Mai Dung
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\(3\times\frac{6}{11}+\frac{6}{11}\times5+2\times\frac{6}{11}\text{ }\)

\(=\frac{6}{11}\times\left(3+5+2\right)\)

\(=\frac{6}{11}\times10\)

\(=\frac{60}{11}\)

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Nguyễn Ngọc Bảo Linh
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Đinh Hoàng Sơn
26 tháng 2 2022 lúc 19:53
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Thùy Linh
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Nguyễn Lê Phước Thịnh
9 tháng 3 2022 lúc 21:48

Bài 4: 

a: \(=\dfrac{11}{21}\left(\dfrac{7}{4}+\dfrac{5}{4}\right)=\dfrac{11}{21}\cdot3=\dfrac{11}{7}\)

b: \(=\dfrac{6}{13}\left(\dfrac{23}{14}-\dfrac{9}{14}\right)=\dfrac{6}{13}\)

Khiết Họa Điềm
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Nguyễn Lê Phước Thịnh
9 tháng 3 2022 lúc 21:52

Bài 4: 

a: =11/21(7/4+5/4)=11/21x3=11/7

b: =6/13(23/14-9/14)=6/13