\(\left[\left(\frac{-3}{4}\right).^3\right]^2\)

cái này là sao?

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Trả lời :

\(\left[\left(\frac{-3}{4}\right)^3\right]^2\)

\(=\left[-\frac{27}{64}\right]^2\)

\(=\frac{729}{4096}\)

Study well 

10 tháng 9 2019

\(=\left[-\frac{27}{64}\right]^2\)

\(=\frac{729}{4096}\)

Học tốt

29 tháng 9 2017

Chưa có ai trả lời câu hỏi này, hãy gửi một câu trả lời để giúp Nguyễn Hải Đăng giải bài toán này.

29 tháng 9 2017

\(A=\frac{\frac{1}{2}:\left(\frac{1}{3}\right)^2\cdot\left(\frac{3}{2}\right)^2}{-0,75:\left(\frac{1}{4}\right)^2\cdot\left(\frac{4}{3}\right)^3}\)

\(=\frac{\frac{81}{8}}{-\frac{256}{9}}=-\frac{729}{2048}\)

Bài 2:

\(\left(\frac{-2}{3}\right)^3:\frac{3}{4}+\left(\frac{-2}{3}\right)^4:\left(\frac{3}{2}\right)^2\)

\(=\left(\frac{-2}{3}\right)^3\cdot\frac{4}{3}+\left[\left(\frac{-2}{3}\right)^3\cdot\frac{4}{3}\right]\cdot\frac{-2}{3}\cdot\frac{1}{3}\)

\(=\frac{-32}{81}+\frac{-32}{81}\cdot\frac{-2}{9}\)

\(=\frac{-32}{81}\left(1+\frac{-2}{9}\right)=\frac{-32}{81}\cdot\frac{7}{9}=-\frac{224}{729}\)

Bài 3:

Xét 2 trường hợp:

TH1: \(\text{3-2x=0}\Rightarrow x=\frac{3}{2}\)(thỏa mãn)

TH2: \(x=\frac{1}{2}\)(thỏa mãn)

Bài 4:

Điều kiện: \(y\ge\frac{1}{3}:2=\frac{1}{6}\)

Xét \(\frac{1}{6}\le y\le\frac{1}{2}\) ta có:

\(\frac{1}{2}-y=2y-\frac{1}{3}\Rightarrow3y=\frac{5}{6}\Rightarrow y=\frac{5}{18}\)(chọn)

\(\Rightarrow y^3=\frac{125}{5832}\)

Xét \(y>\frac{1}{2}\)ta có:

\(y-\frac{1}{2}=2y-\frac{1}{3}\Rightarrow y=\frac{-1}{6}\) (loại)

\(\Rightarrow y^3=-\frac{1}{216}\)

17 tháng 12 2016

a.\(\left(\left(\frac{3}{4}\right)^3\right)^2=\left(\frac{16}{9}\right)^x\Leftrightarrow\left(\frac{3}{4}\right)^6=\left(\frac{4}{3}\right)^{2x}\Leftrightarrow x=-3\)

b. \(\left(\frac{1}{3}\right)^x=3^{-3}\Leftrightarrow\left(\frac{1}{3}\right)^x=\left(\frac{1}{3}\right)^3\Leftrightarrow x=3\)

1 tháng 9 2019

Bạn khử như thế đúng rồi đó nha !

10 tháng 2 2018

a) = -1x2y3z

b) = -\(\frac{1}{15}\)x3y3

27 tháng 9 2016

a) (4/9 + 1/3)^2

= (4/9 + 3/9)^2

= (7/9)^2

= 49/81

b) (1/2 - 3/5)^3

= (5/10 - 6/10)^3

= (-1/10)^3

= -1/1000

c) (-10/3)^5 x (-6/5)^4

= tương tự những câu trên

d) cũng tương tự nhé

27 tháng 9 2016

la sao mk ko hieu

12 tháng 7 2019

a)\(\left(\frac{1}{3}\right)^{-1}-\left(-\frac{6}{7}\right)^0+\left(\frac{1}{2}\right)^4.2^3=3-1+\frac{1}{16}.8=3-1+\frac{1}{2}=\frac{5}{2}\\ \)

b)\(2^2.2^3.\left(\frac{2}{3}\right)^{-2}=2^5.\frac{9}{4}=72\)

c)\(\left(\frac{4}{3}\right)^{-2}.\left(\frac{3}{4}\right)^3:\left(\frac{-2}{3}\right)^{-3}=\left(\frac{3}{4}\right)^2.\left(\frac{3}{4}\right)^3:\left(\frac{-2}{3}\right)^{-3}=\left(\frac{3}{4}\right)^5:\left(\frac{3}{2}\right)^3=\frac{9}{128}\)

2)

\(3^{x+1}=9^x\Leftrightarrow3^x.3=9^x\Rightarrow3=9^x:3^x\Rightarrow3=3^x\Rightarrow x=1\)

\(\left(x-0,1\right)^2=6,25\Leftrightarrow\left(x-0,1\right)^2=2,5^2\Rightarrow\left(x-0,1\right)=2,5\Rightarrow x=2,5+0,1=2,6\)

\(3^{2x-1}=243\Leftrightarrow3^{2x-1}=3^5\Rightarrow2x-1=5\Rightarrow2x=6\Rightarrow x=3\)

\(\left(4x-3\right)^4=\left(4x-3\right)^2\Rightarrow x=1\)

...
Đọc tiếp

\(\left(\frac{-5}{12}+\frac{7}{4}-\frac{3}{8}\right)-\left[4\frac{1}{2}-7\frac{1}{3}\right]-\left(\frac{1}{4}-\frac{5}{2}\right)\)

\(\left[2\frac{1}{4}-5\frac{3}{2}\right]-\left(\frac{3}{10}-1\right)-5\frac{1}{2}+\left(\frac{1}{3}-\frac{5}{6}\right)\)

\(\frac{4}{7}-\left(3\frac{2}{5}-1\frac{1}{2}\right)-\frac{5}{21}+\left[3\frac{1}{2}-4\frac{2}{3}\right]\)

\(\frac{1}{8}-1\frac{3}{4}+\left(\frac{7}{8}-3\frac{7}{2}+\frac{3}{4}\right)-\left[\frac{7}{4}-\frac{5}{8}\right]\)

\(\left(\frac{3}{5}-2\frac{1}{10}+\frac{11}{20}\right)-\left[\frac{-3}{4}+1\frac{7}{2}\right]\)

\(\left[-2\frac{1}{5}-2\frac{2}{3}\right]-\left(\frac{1}{15}-5\frac{1}{2}\right)+\left[\frac{-1}{6}+\frac{1}{3}\right]\)

\(1\frac{1}{8}-\left(\frac{1}{15}-\frac{1}{2}+\frac{-1}{6}\right)+\left[\frac{5}{4}+\frac{3}{2}\right]\)

\(\frac{5}{6}-\left(1\frac{1}{3}-1\frac{1}{2}\right)+\left[\frac{5}{12}-\frac{3}{4}-\frac{1}{6}\right]\)

\(1\frac{1}{4}-\left(\frac{7}{12}-\frac{2}{3}-1\frac{3}{8}\right)+\left[\frac{5}{24}-2\frac{1}{2}\right]-\frac{1}{6}-\left[\frac{-3}{4}\right]\)

\(-2\frac{1}{5}+2\frac{3}{10}-\left(\frac{6}{20}-\left[\frac{2}{8}-1\frac{1}{2}\right]\right)+\left[\frac{7}{20}-1\frac{1}{4}\right]\)

\(-\left[1\frac{2}{3}-3\frac{1}{2}+\frac{1}{4}\right]+\left(\frac{2}{6}-\frac{5}{12}\right)-\left(\frac{1}{3}-\left[\frac{1}{4}-\frac{1}{3}\right]\right)\)

\(-\frac{4}{5}-\left(1\frac{1}{10}-\frac{7}{10}\right)+\left[\frac{3}{4}-1\frac{1}{5}\right]+1\frac{1}{2}\)

\(\frac{3}{21}-\frac{5}{14}+\left[1\frac{1}{3}-5\frac{1}{2}+\frac{5}{14}\right]-\left(\frac{1}{6}-\frac{3}{7}+\frac{1}{3}\right)\)

\(-1\frac{2}{5}+\left[1\frac{3}{10}-\frac{7}{20}-1\frac{1}{4}\right]-\left(\frac{1}{5}-\left[\frac{3}{4}-1\frac{1}{2}\right]\right)\)

\(2\frac{1}{3}-\left(\frac{1}{2}-2\frac{1}{6}+\frac{3}{4}\right)+\left[\frac{5}{12}-1\frac{1}{3}\right]-\frac{7}{8}+3\frac{1}{2}\)

\(2\frac{1}{4}-1\frac{3}{5}-\left(\frac{9}{20}-\frac{7}{10}\right)+\left[1\frac{3}{5}-2\frac{1}{2}\right]+\frac{3}{4}\)

\(\left[\frac{8}{3}-5\frac{1}{4}+\frac{1}{6}\right]-\frac{7}{4}+\frac{-5}{12}-\left(1-1\frac{1}{2}+\frac{1}{3}\right)\)

\(\left(\frac{1}{4}-\left[1\frac{1}{4}-\frac{7}{10}\right]+\frac{1}{2}\right)-2\frac{1}{5}-1\frac{3}{10}+\left[1-\frac{1}{2}\right]\)

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