Tính a,$\dfrac{3}{4}$ - $\dfrac{1}{12}$ - $\dfrac{1}{6}$ 2 b,$\dfrac{2}{5}$ $\dfrac{3}{10}$ $\dfrac{4}{5}$ - $\dfrac{5}{6}$ ...

3

TN

Thắng Nguyễn Mạnh

3 tháng 3 2022

Mình đang cần gấp!☹

TN

Thắng Nguyễn Mạnh

3 tháng 3 2022

Đ V T H

Tính: a) $\dfrac{13}{14}$-$\dfrac{-7}{8}$+$\dfrac{-3}{2}$b) $\dfrac{5}{17}$+$\dfrac{-15}{34}$.$\dfrac{2}{5}$c) $\dfrac{1}{5}$:$\dfrac{1}{10}$-$\dfrac{1}{3}$.($\dfrac{6}{5}$-$\dfrac{2}{4}$)d) $\dfrac{-3}{4}$:($\dfrac{12}{-5}$-$\dfrac{-7}{10}$)*Lưu ý: Không viết luôn kết quả, giải chi...

AT

Anh Tuấn Đào

7 tháng 4 2022

3. Tính :a/ $\dfrac{-1}{2}$ + $\dfrac{5}{6}$ + $\dfrac{1}{3}$ b/ $\dfrac{-3}{8}$ + $\dfrac{7}{4}$ - $\dfrac{1}{12}$ c/ $\dfrac{3}{5}$ : ($\dfrac{1}{4}$ . $\dfrac{7}{5}$) d/ $\dfrac{10}{11}$ + $\dfrac{4}{11}$ : 4...

1

K

Knight™

7 tháng 4 2022

$a,\dfrac{13}{14}\cdot\dfrac{-7}{8}+\dfrac{-3}{2}$

$=-\dfrac{13}{16}+\dfrac{-3}{2}$

$=-\dfrac{13}{16}+\dfrac{-24}{16}$

$=-\dfrac{37}{16}$

$b,\dfrac{5}{17}+\dfrac{-15}{34}\cdot\dfrac{2}{5}$

$=\dfrac{5}{17}+\dfrac{-3}{17}$

$=\dfrac{2}{17}$

$c,\dfrac{1}{5}:\dfrac{1}{10}-\dfrac{1}{3}\cdot\left(\dfrac{6}{5}-\dfrac{2}{4}\right)$

$=2-\dfrac{1}{3}\cdot\dfrac{7}{10}$

$=2-\dfrac{7}{30}$

$=\dfrac{53}{30}$

$d,\dfrac{-3}{4}:\left(\dfrac{12}{-5}-\dfrac{-7}{10}\right)$

$=\dfrac{-3}{4}:\dfrac{-17}{10}$

$=\dfrac{15}{34}$

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AT

Anh Tuấn Đào

7 tháng 4 2022

Ý a anh chép sai đề bài nên làm sai rùi kìa!~

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3M

34.Hoàng Mai Uyên

11 tháng 2 2022

1

TD

Trần Đức Huy

11 tháng 2 2022

3.a)$\dfrac{-1}{2}+\dfrac{5}{6}+\dfrac{1}{3}=\dfrac{-3}{6}+\dfrac{5}{6}+\dfrac{2}{6}=\dfrac{-3+5+2}{6}=\dfrac{4}{6}=\dfrac{2}{3}$

b)$\dfrac{-3}{8}+\dfrac{7}{4}-\dfrac{1}{12}=\dfrac{-9}{24}+\dfrac{42}{24}-\dfrac{2}{24}=\dfrac{-9+42-2}{24}=\dfrac{31}{24}$

c)$\dfrac{3}{5}:\left(\dfrac{1}{4}.\dfrac{7}{5}\right)=\dfrac{3}{5}:\dfrac{7}{20}=\dfrac{3}{5}.\dfrac{20}{7}=\dfrac{12}{7}$

d)$\dfrac{10}{11}+\dfrac{4}{11}:4-\dfrac{1}{8}=\dfrac{10}{11}+\dfrac{4}{11}.\dfrac{1}{4}-\dfrac{1}{8}=\dfrac{10}{11}+\dfrac{1}{11}-\dfrac{1}{8}=1-\dfrac{1}{8}=\dfrac{8}{8}-\dfrac{1}{8}=\dfrac{7}{8}$

Tính (theo mẫu).Mẫu: $\dfrac{1}{2}-\dfrac{5}{12}=\dfrac{6}{12}-\dfrac{5}{12}=\dfrac{6-5}{12}=\dfrac{1}{12}$a) $\dfrac{3}{4}-\dfrac{1}{8}$ b) $\dfrac{2}{6}-\dfrac{5}{18}$ ...

ML

Minh Lệ

24 tháng 8 2023

1

GL

Gia Linh

24 tháng 8 2023

a) $\dfrac{3}{4}-\dfrac{1}{8}=\dfrac{6}{8}-\dfrac{1}{8}=\dfrac{6-1}{8}=\dfrac{5}{8}$

b) $\dfrac{2}{6}-\dfrac{5}{18}=\dfrac{6}{18}-\dfrac{5}{18}=\dfrac{6-5}{18}=\dfrac{1}{18}$

c) $\dfrac{2}{5}-\dfrac{3}{20}=\dfrac{8}{20}-\dfrac{3}{20}=\dfrac{8-3}{20}=\dfrac{5}{20}=\dfrac{1}{4}$

Bài 1 : Thực hiện phép tính a/ $\dfrac{7}{6}$ - $\dfrac{13}{12}$ + $\dfrac{3}{4}$b/ 1 $\dfrac{1}{2}$ . $\dfrac{-4}{5}$ + $\dfrac{3}{10}$c/ $\dfrac{25}{9}$ . $\dfrac{3}{10}$ + ( $\dfrac{-5}{3}$ )$^2$ . $\dfrac{7}{10}$ + | $\dfrac{-25}{3}$ | Bài 2 : Tìm x , biếta/ x - $\dfrac{5}{6}$ = $\dfrac{1}{4}$b/ $\dfrac{26}{x}$ = $\dfrac{-13}{-15}$( Cần gấp...

C

Cihce

27 tháng 9 2021

Tính (theo mẫu).Mẫu: $2+\dfrac{1}{6}=\dfrac{12}{6}+\dfrac{1}{6}=\dfrac{13}{6};1-\dfrac{1}{4}=\dfrac{4}{4}-\dfrac{1}{4}=\dfrac{3}{4}$a) $1+\dfrac{4}{9}$ b) $5+\dfrac{1}{2}$ c) $3-\dfrac{5}{6}$ ...

#Toán lớp 7

0

ML

Minh Lệ

24 tháng 8 2023

1

GL

Gia Linh

24 tháng 8 2023

a) $1+\dfrac{4}{9}=\dfrac{9}{9}+\dfrac{4}{9}=\dfrac{9+4}{9}=\dfrac{13}{9}$

b) $5+\dfrac{1}{2}=\dfrac{10}{2}+\dfrac{1}{2}=\dfrac{10+1}{2}=\dfrac{11}{2}$

c) $3-\dfrac{5}{6}=\dfrac{18}{6}-\dfrac{5}{6}=\dfrac{18-5}{6}=\dfrac{13}{6}$

d) $\dfrac{31}{7}-2=\dfrac{31}{7}-\dfrac{14}{7}=\dfrac{31-14}{7}=\dfrac{17}{7}$

KJ

❖ Khang/GD❄ 『ʈєɑɱ❖Hoàng๖ۣۜGia☆』

12 tháng 3 2022

Tính:

$a,\left(\dfrac{5}{12}-\dfrac{3}{4}\right).\dfrac{-6}{5}+\dfrac{-7}{6}$

$b,\left(5\dfrac{1}{2}-5\right)^2+\dfrac{-1}{6}:\dfrac{5}{3}$

$c,75\%-1\dfrac{1}{2}+0,5:\dfrac{5}{12}$

Đ, S?a) $\dfrac{1}{2}-\dfrac{1}{8}=\dfrac{3}{8}$ b) $\dfrac{7}{10}-\dfrac{1}{5}=\dfrac{6}{5}$ c) $\dfrac{5}{4}+\dfrac{5}{12}=\dfrac{5}{16}$ ...

0

ML

Minh Lệ

24 tháng 8 2023

1

E

Error

24 tháng 8 2023

a) Đ

b) S

$\dfrac{7}{10}-\dfrac{1}{5} \\ =\dfrac{7}{10}-\dfrac{2}{10}\\ =\dfrac{5}{10}=\dfrac{1}{2}$

c) S

$\dfrac{5}{4}+\dfrac{5}{12}\\ =\dfrac{15}{12}+\dfrac{5}{12}\\ =\dfrac{20}{12}=\dfrac{5}{3}$

d) Đ

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NT

Nguyễn Thị Diệu Ly

6 tháng 3 2021

tính GTBT:

a)a.$\left(\dfrac{-3}{2}\right)+a.\dfrac{1}{4}-a.\dfrac{5}{6}vớia=\dfrac{3}{5}$

b)$\dfrac{2}{5}.b-\dfrac{1}{3}.b+b.\left(\dfrac{-1}{2}\right)vớib=\dfrac{6}{13}$

c)c.$\dfrac{5}{6}+\dfrac{3}{4}.c-\dfrac{11}{12}.c$ với c=$\dfrac{2019}{2020}$

2

NL

Nguyễn Lê Phước Thịnh

6 tháng 3 2021

a) Ta có: $a\left(-\dfrac{3}{2}\right)+a\cdot\dfrac{1}{4}-a\cdot\dfrac{5}{6}$

$=a\left(-\dfrac{3}{2}+\dfrac{1}{4}-\dfrac{5}{6}\right)$

$=a\left(\dfrac{-18}{12}+\dfrac{3}{12}-\dfrac{10}{12}\right)$

$=a\cdot\dfrac{-25}{12}$(1)

Thay $a=\dfrac{3}{5}$ vào biểu thức (1), ta được:

$\dfrac{3}{5}\cdot\dfrac{-25}{12}=\dfrac{-75}{60}=\dfrac{-5}{4}$

H

huyenthoaikk

19 tháng 3 2021

a) Ta có: $a (- \frac{3}{2}) + a \cdot \frac{1}{4} - a \cdot \frac{5}{6}$

$= a (- \frac{3}{2} + \frac{1}{4} - \frac{5}{6})$

$= a (\frac{- 18}{12} + \frac{3}{12} - \frac{10}{12})$

$= a \cdot \frac{- 25}{12}$ (1)

Thay $a = \frac{3}{5}$ vào biểu thức (1), ta được:

$\frac{3}{5} \cdot \frac{- 25}{12} = \frac{- 75}{60} = \frac{- 5}{4}$

Bài 1. Tính A= $\left(8\dfrac{2}{7}-4\dfrac{2}{7}\right)-3\dfrac{4}{9}$ B= $\left(10\dfrac{2}{9}-6\dfrac{2}{9}\right)+2\dfrac{3}{5}$Bài 2. Tính a) $5\dfrac{1}{2}.3\dfrac{1}{4}$ b) $6\dfrac{1}{3}:4\dfrac{2}{9}$ ...

MN

Miru nèe

16 tháng 6 2021

3

Y

Yeutoanhoc

16 tháng 6 2021

`A=(8 2/7-4 2/7)-3 4/9`

`=8+2/7-4-2/7-3-4/9`

`=4-3-4/9`

`=1-4/9=5/9`

`B=(10 2/9-6 2/9)+2 3/5`

`=10+2/9-6-2/9+2+3/5`

`=4+2+3/5`

`=6+3/5=33/5`

Bài 2:

`a)5 1/2*3 1/4`

`=11/2*13/4`

`=143/8`

`b)6 1/3:4 2/9`

`=19/3:38/9`

`=19/3*9/38=3/2`

`c)4 3/7*2`

`=31/7*2`

`=62/7`

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T

꧁_͏ͥ͏_͏ͣ͏_͏ͫ͏ ¡亗ᵛᶰシ๖ۣۜT๖ۣۜR๖ۣۜÂ๖ۣ...

16 tháng 6 2021

Bài 1:

$A=\left(8\dfrac{2}{7}-4\dfrac{2}{7}\right)-3\dfrac{4}{9}$

$A=\left(\dfrac{58}{7}-\dfrac{30}{7}\right)-\dfrac{31}{9}$

$A=4-\dfrac{31}{9}$

$A=\dfrac{5}{9}$

$B=\left(10\dfrac{2}{9}-6\dfrac{2}{9}\right)+2\dfrac{3}{5}$

$B=\left(\dfrac{92}{9}-\dfrac{56}{9}\right)+\dfrac{13}{5}$

$B=4+\dfrac{13}{5}$

$B=\dfrac{33}{5}$