Thực hiện phép tính: a) (6$\dfrac{4}{9}$ 3 $\dfrac{7}{11}$) - 4$\dfrac{4}{9}$ b) $\dfrac{1}{7}$. $\dfrac{1}{5}$ $\dfrac{1}{7}$ . $\dfrac{2}{5}$ $\dfrac{1}{7}$ .\(\dfrac{4...

Thực hiện phép tính: a) $11\dfrac{3}{4}-\left(6\dfrac{5}{6}-4\dfrac{1}{2}\right)+1\dfrac{2}{3}$ b) $2\dfrac{17}{20}-1\dfrac{11}{15}+6\dfrac{9}{20}:3$ ...

0

TT

Trần Thị Thảo

21 tháng 4 2022

Thực hiện phép tính (hợp lí nếu có thể): a) ($\dfrac{-6}{11}$) . $\dfrac{7}{10}$ . $\dfrac{11}{-6}$ . (-20) b) ($-1\dfrac{1}{2}$) : $\dfrac{3}{4}$ . $-4\dfrac{1}{2}$) c) $13\dfrac{2}{7}$ : ($\dfrac{-8}{9}$) + $2\dfrac{5}{7}$ :...

1

NL

Nguyễn Lê Phước Thịnh

27 tháng 6 2023

a: =11+3/4-6-5/6+4+1/2+1+2/3

=10+9/12-10/12+6/12+8/12

=10+13/12=133/12

b: $=2+\dfrac{17}{20}-1-\dfrac{11}{15}+2+\dfrac{3}{20}$

=3-11/15

=34/15

c: $=\dfrac{31}{7}:\left(\dfrac{7}{5}\cdot\dfrac{31}{7}\right)$

$=\dfrac{31}{7}:\dfrac{31}{5}=\dfrac{5}{7}$

d: $=\dfrac{29}{8}\cdot\dfrac{36}{29}\cdot\dfrac{15}{23}\cdot\dfrac{23}{5}=\dfrac{9}{2}\cdot3=\dfrac{27}{2}$

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LP

Lê Phương Linh

17 tháng 9 2023

#Toán lớp 7

1

DT

Đoàn Trần Quỳnh Hương

17 tháng 9 2023

$a.\left[-\dfrac{6}{11}.\dfrac{11}{-6}\right].\dfrac{7}{10}.\left(-20\right)=1.7.\left(-2\right)=-14$

$b.\dfrac{-1}{2}:\dfrac{3}{4}.\dfrac{-7}{2}=\dfrac{7}{4}:\dfrac{3}{4}=\dfrac{7}{3}$

$c.\dfrac{93}{7}:-\dfrac{8}{9}+\dfrac{19}{7}:\dfrac{-8}{9}=\left(\dfrac{93}{7}+\dfrac{19}{7}\right):-\dfrac{8}{9}=\dfrac{-9}{8}.\dfrac{112}{7}=-18$

Thực hiện phép tính (hợp lí nếu có thể): a) $13\dfrac{2}{7}$ : ($\dfrac{-8}{9}$) + $2\dfrac{5}{7}$ : ($\dfrac{-8}{9}$) b) ($\dfrac{-6}{11}$) . $\dfrac{7}{10}$ . ($\dfrac{11}{-6}$) . (-20) c) ($-1\dfrac{1}{2}$) : $\dfrac{3}{4}$ ....

LP

Lê Phương Linh

18 tháng 9 2023

#Toán lớp 7

1

ED

🐟 ⋆ 🐇 🎀 𝒩𝑔𝓊𝓎ễ𝓃 Đă𝓃𝑔 𝒩𝒽â𝓃 🎀 🐇 ⋆ 🐟

18 tháng 9 2023

a) $=\left(13\dfrac{2}{7}+2\dfrac{5}{7}\right):\left(-\dfrac{8}{9}\right)$

$=16:\dfrac{-8}{9}=\dfrac{-8\cdot\left(-2\right)\cdot9}{-8}=-18$

b)

$=\left(\dfrac{-6}{11}\cdot\dfrac{11}{-6}\right)\cdot\dfrac{7\cdot10\cdot\left(-2\right)}{10}$

$=-14$

c) $=\dfrac{-1}{2}\cdot\dfrac{4}{3}\cdot\dfrac{-7}{2}$

$=\dfrac{-1\cdot2\cdot2\cdot\left(-7\right)}{2\cdot3\cdot2}=\dfrac{7}{3}$

Bài 1 . Thực hiện phép tính sau :a. $\dfrac{-4}{11}$. $\dfrac{7}{9}$+$\dfrac{-4}{11}$ . $\dfrac{2}{9}$ - $\dfrac{7}{11}$b. $\dfrac{3}{5}$:$\dfrac{-7}{10}$+ 0,5 - $\left(-\dfrac{9}{14}\right)$c. $\dfrac{3}{5}$-$\dfrac{8}{5}$: (5,25+75%)Bài 2 . Tìm x :a) x - $\dfrac{1}{2}$= $\dfrac{-1}{10}$ b.$\dfrac{2}{3}x$ - $\dfrac{7}{6}$=$\dfrac{5}{2}$ c)2,5...

MN

Miru nèe

5 tháng 6 2021

3

SH

Sang Hạ

5 tháng 6 2021

Mik làm Bài 2 nhé ~

Bài 2 :

a) $x-\dfrac{1}{2}=-\dfrac{1}{10}$

$x=-\dfrac{1}{10}+\dfrac{1}{2}$

$x=\dfrac{2}{5}$

b) $\dfrac{2}{3}x-\dfrac{7}{6}=\dfrac{5}{2}$

$\dfrac{2}{3}x=\dfrac{5}{2}+\dfrac{7}{6}$

$\dfrac{2}{3}x=\dfrac{11}{3}$

$x=\dfrac{11}{3}:\dfrac{2}{3}$

$x=\dfrac{11}{3}.\dfrac{3}{2}$

$x=\dfrac{11}{2}$

c) $2,5-\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=\dfrac{3}{4}$

$\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=2,5-\dfrac{3}{4}$

$\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=\dfrac{5}{2}-\dfrac{3}{4}$

$\dfrac{1}{8}x+\dfrac{1}{2}=\dfrac{7}{4}$

$\dfrac{1}{8}x=\dfrac{7}{4}-\dfrac{1}{2}$

$\dfrac{1}{8}x=\dfrac{5}{4}$

$x=10$

T

꧁_͏ͥ͏_͏ͣ͏_͏ͫ͏ ¡亗ᵛᶰシ๖ۣۜT๖ۣۜR๖ۣۜÂ๖ۣ...

5 tháng 6 2021

Bài 1:

a) $\dfrac{-4}{11}.\dfrac{7}{9}+\dfrac{-4}{11}.\dfrac{2}{9}-\dfrac{7}{11}$

$=\dfrac{-4}{11}.\left(\dfrac{7}{9}+\dfrac{2}{9}\right)-\dfrac{7}{11}$

$=\dfrac{-4}{11}.1-\dfrac{7}{11}$

$=\dfrac{-4}{11}-\dfrac{7}{11}$

$=-1$

b) $\dfrac{3}{5}:\dfrac{-7}{10}+0,5-\left(\dfrac{-9}{14}\right)$

$=\dfrac{-6}{7}+\dfrac{1}{2}+\dfrac{9}{14}$

$=\dfrac{2}{7}$

c) $\dfrac{3}{5}-\dfrac{8}{5}:\left(5,25+75\%\right)$

$=\dfrac{3}{5}-\dfrac{8}{5}:\left(\dfrac{21}{4}+\dfrac{3}{4}\right)$

$=\dfrac{3}{5}-\dfrac{8}{5}:6$

$=\dfrac{3}{5}-\dfrac{4}{15}$

$=\dfrac{1}{3}$

Thực hiện phép tính ( tính nhanh nếu có thể ) a, -5/21 + -2/21 + 8/24b, 4/11 . -2/7 + 4/11 . -4/7 + 4/11 . -1/7c, $10\dfrac{5}{9}$ - ( $3\dfrac{5}{7}$ + $4\dfrac{5}{9}$ )d, 1/3 + $1\dfrac{3}{4}$ - ( $1\dfrac{3}{4}$ - 80% )e, $5\dfrac{3}{5}$ + $7\dfrac{21}{48}$ : 10/7 - $5\dfrac{21}{48}$ : 10/7f, -5/7 . 2/11 - 5/11 . 9/7 + $2\dfrac{5}{7}$g, -3/13 . 6/8 + 7/13 . -3/8...

HA

Hà An Trần

18 tháng 2 2022

3

NL

Nguyễn Lê Phước Thịnh

18 tháng 2 2022

a: =-1/3+1/3=0

b: $=\dfrac{4}{11}\left(-\dfrac{2}{7}-\dfrac{4}{7}-\dfrac{1}{7}\right)=\dfrac{4}{11}\cdot\left(-1\right)=-\dfrac{4}{11}$

c: $=10+\dfrac{5}{9}-3-\dfrac{5}{7}-4-\dfrac{5}{9}=3-\dfrac{5}{7}=\dfrac{16}{7}$

d: $=\dfrac{1}{3}+\dfrac{7}{4}-\dfrac{7}{4}+\dfrac{4}{5}=\dfrac{1}{3}+\dfrac{4}{5}=\dfrac{5+12}{15}=\dfrac{17}{15}$

PH

Phạm Hải Nam

18 tháng 2 2022

a: =-1/3+1/3=0

b: $= \frac{4}{11} (- \frac{2}{7} - \frac{4}{7} - \frac{1}{7}) = \frac{4}{11} \cdot (- 1) = - \frac{4}{11}$

c: $= 10 + \frac{5}{9} - 3 - \frac{5}{7} - 4 - \frac{5}{9} = 3 - \frac{5}{7} = \frac{16}{7}$

d: $= \frac{1}{3} + \frac{7}{4} - \frac{7}{4} + \frac{4}{5} = \frac{1}{3} + \frac{4}{5} = \frac{5 + 12}{15} = \frac{17}{15}$

HN

Học ngu lắm

22 tháng 2 2022

Thực hiện phép tính ( tính hợ lí nếu được)
a, $\dfrac{3}{4}+\dfrac{9}{5}:\dfrac{3}{2}-1$ b, $\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{4}{13}.\dfrac{6}{7}$

2

NL

Nguyễn Lê Phước Thịnh

22 tháng 2 2022

a: $=\dfrac{3}{4}+\dfrac{9}{5}\cdot\dfrac{2}{3}-1=\dfrac{3}{4}+\dfrac{6}{5}-1=\dfrac{19}{20}$

b: $=\dfrac{6}{7}\left(\dfrac{8}{13}+\dfrac{9}{13}-\dfrac{4}{13}\right)=\dfrac{6}{7}\cdot\dfrac{13}{13}=\dfrac{6}{7}$

D

^($_DUY_$)^

22 tháng 2 2022

Thực hiện phép tính ( tính hợ lí nếu được)
a, $\dfrac{3}{4}+\dfrac{9}{5}:\dfrac{3}{2}-1$ b, $\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{4}{13}.\dfrac{6}{7}$
= $\dfrac{3}{4}+\dfrac{6}{5}-1$ = $\dfrac{6}{7}.\left(\dfrac{8}{13}+\dfrac{9}{13}-\dfrac{4}{13}\right)$
= $\dfrac{15}{20}+\dfrac{24}{20}-\dfrac{20}{20}$ = $\dfrac{6}{7}.\left(\dfrac{17}{13}-\dfrac{4}{13}\right)$
= $\dfrac{39}{20}-\dfrac{20}{20}$ = $\dfrac{6}{7}.1$
= $\dfrac{19}{20}$ = $\dfrac{6}{7}$

LN

Lê Ngọc Anh

10 tháng 3 2022

Thực hiện phép tính (tính nhanh nếu có thể)

a) -19+7+9+19

b) $11\dfrac{3}{13}-\left(2\dfrac{4}{7}+5\dfrac{3}{13}\right)$

c) $\dfrac{2}{7}.5\dfrac{1}{4}-\dfrac{2}{7}.3\dfrac{1}{4}$

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...

1

NL

Nguyễn Lê Phước Thịnh

10 tháng 3 2022

a: =9+7=16

b: =11+3/13-2-4/7-5-3/13

=4-4/7

=28/7-4/7=24/7

c: =2/7(5+1/4-3-1/4)=2/7x2=4/7

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C

Cihce

27 tháng 9 2021

Bài 1: Thực hiện phép tínha) $1-\dfrac{1}{2}+\dfrac{1}{3}$b) $\dfrac{2}{5}+\dfrac{3}{5}:\dfrac{9}{10}$c) $\dfrac{7}{11}.\dfrac{3}{4}+\dfrac{7}{11}.\dfrac{1}{4}+\dfrac{4}{11}$d) $\left(\dfrac{3}{4}+0,5+25\%\right).2\dfrac{2}{3}$\(Bài 2:\text{Tìm...

#Toán lớp 7

0

LD

Linh Dayy

17 tháng 7 2021

3

MN

Minh Ngọc

17 tháng 7 2021

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

$b.$ $\dfrac{2}{5}+\dfrac{3}{5}:\dfrac{9}{10}=\dfrac{2}{5}+\dfrac{3}{5}.\dfrac{10}{9}=\dfrac{2}{5}+\dfrac{2}{3}=\dfrac{6}{15}+\dfrac{10}{15}=\dfrac{6+10}{15}=\dfrac{16}{15}$

$c.$ $\dfrac{7}{11}.\dfrac{3}{4}+\dfrac{7}{11}.\dfrac{1}{4}+\dfrac{4}{11}=\dfrac{21}{44}+\dfrac{7}{44}+\dfrac{4}{11}=\dfrac{21}{44}+\dfrac{7}{44}+\dfrac{16}{44}=\dfrac{21+7+16}{44}=\dfrac{44}{44}=1$