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6 tháng 11 2020

a) \(\frac{1}{5}-\frac{1}{3}+\frac{2}{7}=\frac{21}{105}-\frac{35}{105}+\frac{30}{105}=\frac{16}{105}\)

b) \(\frac{1}{5}.\frac{3}{7}+\frac{4}{5}.\frac{3}{7}=\frac{3}{35}+\frac{12}{35}=\frac{15}{35}=\frac{3}{7}\)

c) \(\sqrt{16}:\sqrt{4}+\sqrt{9}=4:2+3=5\)

d)\(\left(\frac{-1}{4}\right)^4:\left(-\frac{1}{4}\right)=\left(\frac{-1}{4}\right)^3=\frac{-1}{64}\)

26 tháng 2 2020

Bài 1:

a) \(0,5-\frac{5}{41}+\frac{1}{2}-\frac{36}{41}\)

\(=\frac{1}{2}-\frac{5}{41}+\frac{1}{2}-\frac{36}{41}\)

\(=\left(\frac{1}{2}+\frac{1}{2}\right)-\left(\frac{5}{41}+\frac{36}{41}\right)\)

\(=1-1\)

\(=0.\)

b) \(\left(-\frac{2}{3}+\frac{3}{7}\right):\frac{4}{5}+\left(-\frac{1}{3}+\frac{4}{7}\right):\frac{4}{5}\)

\(=-\frac{2}{3}+\frac{3}{7}:\frac{4}{5}-\frac{1}{3}+\frac{4}{7}:\frac{4}{5}\)

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

\(=\left(-1\right)+1:\frac{4}{5}\)

\(=\left(-1\right)+\frac{5}{4}\)

\(=\frac{1}{4}.\)

c) \(\left(-\frac{3}{4}\right).\sqrt{\frac{16}{9}+3.\sqrt{49}}\)

\(=\left(-\frac{3}{4}\right).\sqrt{\frac{16}{9}+3.7}\)

\(=\left(-\frac{3}{4}\right).\sqrt{\frac{16}{9}+21}\)

\(=\left(-\frac{3}{4}\right).\sqrt{\frac{205}{9}}\)

\(=\left(-\frac{3}{4}\right).\frac{\sqrt{205}}{3}\)

\(=-\frac{\sqrt{205}}{4}.\)

d) \(\left(-\frac{1}{3}\right)^2.\frac{4}{11}+1\frac{5}{11}.\left(\frac{1}{3}\right)^2\)

\(=\frac{1}{9}.\frac{4}{11}+\frac{16}{11}.\frac{1}{9}\)

\(=\frac{1}{9}.\left(\frac{4}{11}+\frac{16}{11}\right)\)

\(=\frac{1}{9}.\frac{20}{11}\)

\(=\frac{20}{99}.\)

Chúc bạn học tốt!

26 tháng 2 2020

cảm ơn bạn

1 tháng 2 2020

\(A=\frac{15}{34}+\frac{7}{21}+\frac{9}{34}-1\frac{15}{17}+\frac{2}{3}=\frac{15}{34}+\frac{7}{21}+\frac{9}{34}-\frac{64}{34}+\frac{14}{21}=\left(\frac{15}{34}+\frac{9}{34}-\frac{64}{34}\right)+\left(\frac{7}{21}+\frac{14}{21}\right)=\frac{30}{34}+\frac{21}{21}=\frac{15}{17}+1=\frac{32}{17}\)

17 tháng 12 2016

a) \(\frac{17}{9}-\frac{17}{9}:\left(\frac{7}{3}+\frac{1}{2}\right)\)

= \(\frac{17}{9}-\frac{17}{9}:\frac{17}{6}\)

= \(\frac{17}{9}-\frac{2}{3}\)

= \(\frac{11}{9}\)

b) \(\frac{4}{3}.\frac{2}{5}-\frac{3}{4}.\frac{2}{5}\)

= \(\frac{2}{5}.\left(\frac{4}{3}-\frac{3}{4}\right)\)

= \(\frac{2}{5}.\frac{7}{12}\)

= \(\frac{7}{30}\)

Mình lười làm quá, hay mình nói kết quả cho bn thôi nha

c) -6

d) 3

e) 3

g) 12

h) \(\frac{23}{18}\)

i) \(\frac{-69}{20}\)

k) \(\frac{-1}{2}\)

l) \(\frac{49}{5}\)

21 tháng 10 2018

a) = \(\frac{7}{2}\)

b) = \(\frac{643}{64}\)

c) = 0

30 tháng 1 2019

Ta có: A = \(\left|\frac{4}{9}-\left(\frac{\sqrt{2}}{2}\right)^2\right|+\left|0,\left(4\right)+\frac{\frac{1}{3}-\frac{2}{5}-\frac{3}{7}}{\frac{2}{3}-\frac{4}{5}-\frac{6}{7}}\right|\)

             = \(\left|\frac{4}{7}-\frac{\sqrt{2}^2}{2^2}\right|+\left|0,\left(1\right).4+\frac{\frac{1}{3}-\frac{2}{5}-\frac{3}{7}}{2\left(\frac{1}{3}-\frac{2}{5}-\frac{3}{7}\right)}\right|\)

           = \(\left|\frac{4}{7}-\frac{1}{2}\right|+\left|\frac{1}{9}.4+\frac{1}{2}\right|\)

          = \(\left|\frac{8-7}{14}\right|+\left|\frac{8+9}{18}\right|\)

          = \(\left|\frac{1}{14}\right|+\left|\frac{17}{18}\right|\)

         = 1/14 + 17/18 = 64/63

30 tháng 1 2019

A = \(\left|\frac{4}{9}-\left(\frac{\sqrt{2}}{2}\right)^2\right|+\left|0,\left(4\right)+\frac{\frac{1}{3}-\frac{2}{5}-\frac{3}{7}}{\frac{2}{3}-\frac{4}{5}-\frac{6}{7}}\right|\)

   = \(\left|\frac{4}{9}-\left(\frac{\sqrt{2}^2}{2^2}\right)\right|+\left|0,\left(1\right).4+\frac{\frac{1}{3}-\frac{2}{5}-\frac{3}{7}}{2.\left(\frac{1}{3}-\frac{2}{5}-\frac{3}{7}\right)}\right|\)

  = \(\left|\frac{4}{9}-\frac{1}{2}\right|+\left|\frac{1}{9}.4+\frac{1}{2}\right|\)

\(\left|\frac{8-9}{18}\right|+\left|\frac{4}{9}+\frac{1}{2}\right|\)

\(\left|-\frac{1}{18}\right|+\left|\frac{8+9}{18}\right|\)

\(\frac{1}{18}+\frac{17}{18}=1\)

30 tháng 11 2019

a) \(\frac{3}{5}+\frac{1}{10}-\frac{6}{5}\)

\(=\left(\frac{3}{5}-\frac{6}{5}\right)+\frac{1}{10}\)

\(=\left(-\frac{3}{5}\right)+\frac{1}{10}\)

\(=-\frac{1}{2}.\)

b) \(1\frac{3}{4}.\frac{2}{7}+1\frac{3}{4}.\frac{5}{7}\)

\(=1\frac{3}{4}.\left(\frac{2}{7}+\frac{5}{7}\right)\)

\(=1\frac{3}{4}.1\)

\(=\frac{7}{4}.1\)

\(=\frac{7}{4}.\)

c) Sao lại có dấu chấm phẩy thế kia?

Chúc bạn học tốt!

30 tháng 11 2019

a) \(\frac{3}{5}+\frac{1}{10}-\frac{6}{5}=\frac{6+1-12}{10}=\frac{-5}{10}=\frac{-1}{2}\)

b) \(1\frac{3}{4}.\frac{2}{7}+1\frac{3}{4}.\frac{5}{7}=1\frac{3}{4}\left(\frac{2}{7}+\frac{5}{7}\right)=1\frac{3}{4}.1=1\frac{3}{4}=\frac{7}{4}\)

c)\(\left(\frac{3}{4}\right)^2.\sqrt{16}+\left[\left(-2\right)^3:\left(-8\right)-1^{2019}\right]=\frac{9}{16}.4+\left[\left(-8\right):\left(-8\right)-1\right]=\frac{9}{16}.4=\frac{9}{4}\)