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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 Ngọc Hương Giang
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TL: 

8/15 x 5/6 = 40/90 = 4/9 

41/20 x 3/4 = 123/80 

(11/23 + 9/23) + (18/23 + 2/23) = 20/23 + 20/23 = 40/43 

HT

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Nguyễn Ngọc Tuấn Nam
9 tháng 3 2022 lúc 14:58

\(\left(\frac{2}{3}\times\frac{4}{5}\right)\times\frac{5}{6}\) = \(\frac{2}{3}\times\frac{4}{5}\times\frac{5}{6}\)=\(\frac{2\times4\times5}{3\times5\times6}\)=\(\frac{2\times4\times5}{3\times5\times2\times3}\)=\(\frac{4}{9}\)

\(\frac{11}{23}+\frac{2}{23}+\frac{9}{23}+\frac{18}{23}\)=\(\frac{\left(11+9\right)+\left(18+2\right)}{23}\)=\(\frac{20+20}{23}\)=\(\frac{40}{23}\)

\(\frac{27}{12}+\frac{17}{6}-\frac{25}{36}-\frac{15}{6}\)=\(\left(\frac{27}{12}-\frac{25}{36}\right)+\left(\frac{17}{6}-\frac{15}{6}\right)\)=\(\frac{14}{9}+\frac{2}{6}\)=\(\frac{17}{9}\)

/HT\

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Nguyễn Ngọc Lan Anh
9 tháng 3 2022 lúc 14:47

Nhập các bạn toàn bắt tớ làm à ngu gò mà làm

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Bảnh Hải
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Đỗ Bình An
13 tháng 3 2022 lúc 17:23

nhiều thế

hoàng thị thanh hoa
13 tháng 3 2022 lúc 17:26

sfdhg 

Minh Châu Trần
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Ar 🐶
8 tháng 3 2023 lúc 21:51

loading...  

Ngọc Hân
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nguyễn hải
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Nguyễn Thu Trang
25 tháng 2 2020 lúc 21:10

a) 23*45 -23*35+23*90

= 23* (45-35+90)

= 23*100

= 2300

b) 636/ 6 - 36/ 6

= 600/ 6

= 100

c) 11*607 -607

= 11*607 -607*1

= 607* (11 -1)

= 607*10

= 6070

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legiabinh
25 tháng 2 2020 lúc 21:11

a) 23 x 45 - 23 x 35 + 23 x 90 

=23 x (45 - 35 + 90)

= 23 x 100

= 2300

b) 636 / 6 - 36 / 6

= (636 - 36) /6

= 600/6

=100

c) 11 x 607 - 607

= 607 x ( 11 - 1)

= 607 x 10

=6070

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IS
25 tháng 2 2020 lúc 21:11

a) 23*45 -23*35+23*90
= 23* (45-35+90)
= 23*100
= 2300
b) 636/ 6 - 36/ 6
= 600/ 6
= 100
c) 11*607 -607
= 11*607 -607*1
= 607* (11 -1)
= 607*10

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Khánh Phạm
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Khánh Nam.....!  ( IDΣΛ...
31 tháng 7 2021 lúc 10:14

13/19 x 23/11 - 13/19 x 8/11 - 13/19 x 4/11

= 13/19 x (23/11 - 8/11 - 4/11)

= 13/19 x 1

= 13/19

Phong Thần
31 tháng 7 2021 lúc 10:16

\(\dfrac{13}{19}\times\dfrac{23}{11}-\dfrac{13}{19}\times\dfrac{8}{11}-\dfrac{13}{19}\times\dfrac{4}{11}\\ =\dfrac{13}{19}\times\left(\dfrac{23}{11}-\dfrac{8}{11}-\dfrac{4}{11}\right)\\ =\dfrac{13}{19}\times1=\dfrac{13}{19}\)

Khánh Phạm
31 tháng 7 2021 lúc 10:18

câu b, 20/5x7 + 20/7x9 + 20/ 9 x11 + ..... 20 / 33 x35

Lananhcute
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sakura
2 tháng 3 2017 lúc 17:50

a) \(\frac{7}{18}+\frac{4}{23}+\frac{11}{18}+\frac{19}{23}\)

\(=\left(\frac{7}{18}+\frac{11}{18}\right)+\left(\frac{4}{23}+\frac{19}{23}\right)\)

\(=1+1\)

\(=2\)

b) \(\frac{19}{15}+\frac{31}{23}-\frac{4}{15}-\frac{8}{23}\)

\(=\left(\frac{19}{15}-\frac{4}{15}\right)+\left(\frac{31}{23}-\frac{8}{23}\right)\)

\(=1+1\)

\(=2\)

ủng hộ tớ nha

Hiền Nguyễn Thị
2 tháng 3 2017 lúc 17:56

a) (7/18+11/18)+(4/23+19/23)

=18/18+23/23

=1+1

=2

b)=2

Nguyễn Tuấn Anh
2 tháng 3 2017 lúc 17:57

\(a,b=2\)

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`