Tínha)\(\dfrac{-3}{14}\) \(\dfrac{5}{8}\)-\(\dfrac{1}{2}\) b)\(\dfrac{5}{12}\)-\(\dfrac{24}{5}\).\(\dfrac{1}{6}\)c)\(\dfrac{5}{12}\)-\(\dfrac{24}{5}\).\(\dfrac{1}{6}\) ...

2

NL

Nguyễn Lê Phước Thịnh

11 tháng 2 2022

a: \(=\dfrac{-12}{56}+\dfrac{35}{56}-\dfrac{28}{56}=-\dfrac{5}{56}\)

b: \(=\dfrac{5}{12}-\dfrac{4}{5}=\dfrac{25-48}{60}=\dfrac{-23}{60}\)

d: SỐ cần tìm là:

-24:3/8=-24x8:3=-64

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SM

Sơn Mai Thanh Hoàng

11 tháng 2 2022

a \(\dfrac{-5}{56}\)

b \(\dfrac{-23}{60}\)

c \(\dfrac{-23}{60}\)

d \(\dfrac{-1}{64}\)

NT

Nguyễn Thị Diệu Ly

17 tháng 4 2021

1.tính

a)\(\left(4-\dfrac{12}{5}\right).\dfrac{25}{8}-\dfrac{2}{5}:\dfrac{-4}{25}\)

b)\(\left(\dfrac{-5}{24}+\dfrac{3}{4}-\dfrac{7}{12}\right):\left(\dfrac{-5}{16}\right)\)

c)\(\dfrac{6}{7}+\dfrac{5}{4}:\left(-5\right)-\dfrac{-1}{28}.\left(-2\right)^2\)

ai giải đc mik sẽ tick

2

LT

Lê Thị Bảo Khánh

18 tháng 4 2021

a)\(\left(4-\dfrac{12}{5}\right).\dfrac{25}{8}-\dfrac{2}{5}:\dfrac{-4}{25}\)

\(=\left(\dfrac{4}{1}-\dfrac{12}{5}\right).\dfrac{25}{8}-\dfrac{2}{5}:\dfrac{-4}{25}\)

\(=\left(\dfrac{20}{5}-\dfrac{12}{5}\right).\dfrac{25}{8}-\dfrac{2}{5}:\dfrac{-4}{25}\)

\(=\dfrac{8}{5}.\dfrac{25}{8}-\dfrac{2}{5}:\dfrac{-4}{25}\)

\(=1-\dfrac{2}{5}.\dfrac{25}{-4}\)

\(=1-\dfrac{-5}{2}\)

\(=\dfrac{2}{2}-\dfrac{-5}{2}\)

\(=\dfrac{7}{2}\)

dài quá nên mik sẽ giải lần lượt mỗi câu trả lời là một câu nhá bạn!!

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T

꧁_͏ͥ͏_͏ͣ͏_͏ͫ͏ ¡亗ᵛᶰシ๖ۣۜT๖ۣۜR๖ۣۜÂ๖ۣ...

18 tháng 4 2021

Giải:

a)(4-12/5).25/8-2/5:-4/25

=8/5.25/8-(-5/2)

=5+5/2

=15/2

b)(-5/24+3/4-7/12):(-5/16)

=-1/24:(-5/16)

=2/15

c)6/7+5/4:(-5)-(-1/28).(-2)²

=6/7+(-1/4)-(-1/28).4

=6/7-1/4-(-1/7)

=6/7-1/4+1/7

=(6/7+1/7)-1/4

=1-1/4

=3/4

Chúc bạn học tốt!

Tínha.\(\dfrac{4}{9}+\dfrac{3}{7}\) \(\dfrac{3}{4}+\dfrac{7}{24}\) \(\dfrac{1}{3}+\dfrac{2}{9}+\dfrac{4}{27}\)b.\(\dfrac{5}{6}-\dfrac{3}{8}\) \(\dfrac{7}{15}-\dfrac{11}{30}\) \(\dfrac{2}{3}+\dfrac{1}{6}-\dfrac{7}{12}\)c.\(\dfrac{18}{25}\times\dfrac{15}{6}\) \(\dfrac{30}{49}:\dfrac{6}{7}\) \(\dfrac{1}{2}\times\dfrac{3}{4}:\dfrac{6}{5}\)d.\(8\times\dfrac{3}{5}:\dfrac{12}{5}\) \(4:\dfrac{9}{5}:\dfrac{10}{3}\)3 bn đầu tiên xong mik sẽ...

HK

Hoàng Kim Nhung

12 tháng 7 2023

#Toán lớp 4

1

NL

Nguyễn Lê Phước Thịnh

12 tháng 7 2023

a: 4/9+3/7=28/63+27/63=55/63

3/4+7/24=18/24+7/24=25/24

1/3+2/9+4/27=9/27+6/27+4/27=19/27

b: 5/6-3/8=20/24-9/24=11/24

7/15-11/30=14/30-11/30=3/30=1/10

2/3+1/6-7/12

=8/12+2/12-7/12

=3/12=1/4

c: 18/25*15/6=15/25*18/6=3*3/5=9/5

30/49:6/7=30/49*7/6=210/294=5/7

1/2*3/4:6/5=3/8*5/6=15/48=5/16

d: 8*3/5:12/5=24/5*5/12=2

4:9/5:10/3=4*5/9*3/10=2/3

Tìm các số nguyên x,y biết:a)\(\dfrac{6}{2x+1}=\dfrac{2}{7}\)b) \(\dfrac{24}{7x-3}=\dfrac{-4}{25}\)c) \(\dfrac{4}{x-6}=\dfrac{y}{24}=\dfrac{-12}{18}\)d) \(\dfrac{-1}{5}\le\dfrac{x}{8}\le\dfrac{1}{4}\)e) \(\dfrac{x+46}{20}=x\dfrac{2}{5}\)f) \(y\dfrac{5}{y}=\dfrac{86}{y}\) ( \(x\dfrac{2}{5};y\dfrac{5}{y}\) là các hỗn...

TT

Trần Tiến Đạt

8 tháng 6 2021

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) \(\dfrac{2}{6}-\dfrac{5}{18}\) ...

1

OY

OH-YEAH^^

8 tháng 6 2021

a,\(\dfrac{6}{2x+1}=\dfrac{2}{7}\)

⇒\(\dfrac{6}{2x+1}=\dfrac{6}{21}\)

⇒\(2x+1=21\)

\(2x=21-1\)

\(2x=20\)

⇒\(x=10\)

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ML

Minh Lệ

24 tháng 8 2023

#Toán lớp 4

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

Tìm x biết: a) \(\dfrac{6}{-x}=\dfrac{x}{-24}\) b) \(x-\dfrac{7}{12}x+\dfrac{3}{8}x=\dfrac{5}{24}\) c)\(\left(x-\dfrac{1}{3}\right)^2-\dfrac{1}{2}=1\dfrac{3}{4}\) d) \(\dfrac{x-3}{-2}=\dfrac{-8}{x-3}\) e) \(\dfrac{9}{x}=\dfrac{-35}{105}\) ...

LL

Ly Ly

12 tháng 10 2021

* Thực hiện phép tính

a, \(\left(\dfrac{\sqrt{6}-\sqrt{2}}{1-\sqrt{3}}-\dfrac{5}{\sqrt{5}}\right):\dfrac{1}{\sqrt{5}-\sqrt{2}}\)

b. \(\dfrac{1}{\sqrt{3}}+\dfrac{1}{3\sqrt{2}}+\dfrac{1}{\sqrt{3}}\sqrt{\dfrac{5}{12}-\dfrac{1}{\sqrt{6}}}\)

c. \(\dfrac{2\sqrt{3-\sqrt{3+\sqrt{13+\sqrt{48}}}}}{\sqrt{6}-\sqrt{2}}\)

#Toán lớp 9

1

NL

Nguyễn Lê Phước Thịnh

12 tháng 10 2021

a: Ta có: \(\left(\dfrac{\sqrt{6}-\sqrt{2}}{1-\sqrt{3}}-\dfrac{5}{\sqrt{5}}\right):\dfrac{1}{\sqrt{5}-\sqrt{2}}\)

\(=-\left(\sqrt{5}+\sqrt{2}\right)\left(\sqrt{5}-\sqrt{2}\right)\)

=-5+2

=-3

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TT

Trần Thị Thảo

18 tháng 4 2022

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...

1

NL

Nguyễn Lê Phước Thịnh

29 tháng 6 2023

a: =>6/x=x/24

=>x^2=144

=>x=12 hoặc x=-12

b: =>x(1-7/12+3/8)=5/24

=>x*19/24=5/24

=>x=5/24:19/24=5/19

c: =>(x-1/3)^2=1+3/4+1/2=9/4

=>x-1/3=3/2 hoặc x-1/3=-3/2

=>x=11/6 hoặc x=-7/6

d: =>(x-3)^2=16

=>x-3=4 hoặc x-3=-4

=>x=-1 hoặc x=7

e: =>9/x=-1/3

=>x=-27

f: =>x-1/2=0 hoặc -x/2-3=0

=>x=1/2 hoặc x=-6

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AT

Anh Tuấn Đào

7 tháng 4 2022

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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BY

bae_ỉn yang hồ

8 tháng 11 2021

bài 14: tính

a,\(\dfrac{4}{5}\) + \(\dfrac{1}{4}\) x \(\dfrac{2}{3}\)

b,\(\dfrac{7}{12}\) + \(\dfrac{3}{4}\) : \(\dfrac{3}{8}\) - \(\dfrac{1}{4}\)

1

S

Sabo

8 tháng 11 2021

a,4/5+1/6
=29/30

b,7/12+2-1/4
=31/12-1/4
=7/3

L3

Lily :33

30 tháng 6 2021

Tìm số nguyên x, y biết:

a, \(\dfrac{-1}{5}\)≤ \(\dfrac{x}{8}\)≤ \(\dfrac{1}{4}\)

b, \(\dfrac{4}{x-6}\)= \(\dfrac{y}{24}\)= \(\dfrac{-12}{18}\)

c, \(\dfrac{x+46}{20}\)=x \(\dfrac{2}{5}\)

1

T

꧁_͏ͥ͏_͏ͣ͏_͏ͫ͏ ¡亗ᵛᶰシ๖ۣۜT๖ۣۜR๖ۣۜÂ๖ۣ...

30 tháng 6 2021

Giải:

a) \(\dfrac{-1}{5}\le\dfrac{x}{8}\le\dfrac{1}{4}\)

\(\Rightarrow\dfrac{-8}{40}\le\dfrac{5x}{40}\le\dfrac{10}{40}\)

\(\Rightarrow5x\in\left\{0;\pm5;10\right\}\)

\(\Rightarrow x\in\left\{0;\pm1;2\right\}\)

b) \(\dfrac{4}{x-6}=\dfrac{y}{24}=\dfrac{-12}{18}\)

\(\Rightarrow\dfrac{4}{x-6}=\dfrac{-12}{18}\)

\(\Rightarrow-12.\left(x-6\right)=4.18\)

\(\Rightarrow-12x+72=72\)

\(\Rightarrow-12x=72-72\)

\(\Rightarrow-12x=0\)

\(\Rightarrow x=0:-12\)

\(\Rightarrow x=0\)

\(\Rightarrow\dfrac{y}{24}=\dfrac{-12}{18}\)

\(\Rightarrow y=\dfrac{-12.24}{18}=-16\)

c) \(\dfrac{x+46}{20}=x.\dfrac{2}{5}\)

\(\dfrac{x+46}{20}=\dfrac{2x}{5}\)

\(\Rightarrow5.\left(x+46\right)=2x.20\)

\(\Rightarrow5x+230=40x\)

\(\Rightarrow5x-40x=-230\)

\(\Rightarrow-35x=-230\)

\(\Rightarrow x=-230:-35\)

\(\Rightarrow x=\dfrac{46}{7}\)

Chúc bạn học tốt!