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12 tháng 8 2015

7/23.5/29+7/29.18/23-7/29

=(7.5)/(23.29)+7/29.18/23-7/29

=7/29.5/23+7/29.18/23-7/29.1

=7/29.(5/23+18/23-1)

=7/29.(1-1)

=7/29.0

=0

12 tháng 8 2015

\(\frac{7}{23}\cdot\frac{5}{29}+\frac{7}{29}\cdot\frac{18}{23}-\frac{7}{29}\)

\(=\frac{7}{29}\cdot\frac{5}{23}+\frac{7}{29}\cdot\frac{18}{23}-\frac{7}{29}\)

\(=\frac{7}{29}\cdot\left(\frac{5}{23}+\frac{18}{23}-1\right)\)

\(=\frac{7}{29}\cdot0\)

\(=0\)

 -29.(85-47)-85.(47-29)

=-29.38-85.18

=-1102-1503

=-2605

-15.(23-29)+23-(15-29)

=-15.(-6)+23-(-14)

=90+23+14

=113+14

=127

 -13.(55-29)+23.(15-29)

=-13.26+23.(-14)

=-338+(-322)

=-660

-10.(2+4)-5.(4-3)

=-10.6-5.1

=-60-5

=-65

11 tháng 3 2018

x+126/216=204/216-24/216

=>x+126/216=108/216

=>x=108/216-126/216

=>x=-18/216

=>x=-1/12

a, x + 7/12 = 17/18 - 1/9

    x + 7/12 = 15/18

                x = 15/18 - 7/12

                  x = 1/4

b, 29/30 - ( 13/23 + x ) = 7/69

( 13/23 + x ) = 29/30 - 7/69

13/23 + x = 199/230

              x = 199/230 - 13/23

                x = 3/10

hok tốt

Ta có: \(\left[\left(3+\frac{2}{9}\right)\right]\cdot\frac{15}{23}\cdot\left(1+\frac{7}{29}\right):\frac{5}{23}\)

\(=\frac{29}{9}\cdot\frac{15}{23}\cdot\frac{36}{29}\cdot\frac{23}{5}\)

\(=12\)

6 tháng 2 2022

\(a,-35.12-8.35\)

\(=\left(-35\right)\left(12+8\right)\)

\(=-700\)

\(b,-23.7-7.59-18.7\)

\(=7\left(-23-59-18\right)\)

\(7.\left(-100\right)=-700\)

\(b,115-\left(-12+29\right)\)

\(=115+12-29\)

\(=98\)

\(c,3.\left(-7\right)^2+5.\left(-4\right)^3\)

\(=3.49-5.64\)

\(=147-320\)

\(=-173\)

6 tháng 2 2022

a)-35.12-8-35=-35(12+8)=-35.20=-700

b)23.(-7)-7.5+(-18).7=-7(23+59+18)=-7.100=-700

c)115-(-12+29)=115+12-29=98

d)\(3\left(-7\right)^2+5\left(-4\right)^3=3.7^2-5.4^3=3.49-5.64=147-320-173\)

25 tháng 2 2020

1/ 45. 18 - 5. 9. 28

= 45. 18 - (5. 9) . 28

= 45.18 - 45 .28

= 45. ( 18 - 28)

= 45. ( -10)

= -450

2/ 54 - 6. (12 + 9)

= 54 - 6. 9 + 6. 12

= 54 - 54 + 6. 12

= 0 + 6. 12

= 72

\(\frac{9}{8}-\frac{-11}{8}=\frac{9-\left(-11\right)}{8}=\frac{9+11}{8}=\frac{20}{8}=\frac{5}{2}\)

\(-\frac{1}{2}-\frac{5}{2}=\frac{-1-5}{2}=\frac{-6}{2}=-3\)

\(\frac{4}{3}-\frac{7}{3}=\frac{4-7}{3}=\frac{11}{3}\)

\(\frac{3}{-5}-\frac{-8}{10}=\frac{6}{-10}-\frac{-8}{10}=\frac{-6}{10}-\frac{-8}{10}=\frac{-6-\left(-8\right)}{10}=\frac{-6+8}{10}=\frac{2}{10}=\frac{1}{5}\)

\(\frac{5}{7}-\frac{-3}{21}=\frac{5}{7}-\frac{-1}{7}=\frac{5-\left(-1\right)}{7}=\frac{5+1}{7}=\frac{6}{7}\)

\(\frac{4}{-3}-\frac{9}{27}=\frac{4}{-3}-\frac{1}{3}=\frac{-4}{3}-\frac{1}{3}=\frac{-4-1}{3}=\frac{-5}{3}\)

\(\frac{7}{29}-\frac{9}{29}=\frac{7-9}{29}=\frac{2}{29}\)

\(\frac{-7}{22}-\frac{9}{22}=\frac{-7-9}{22}=\frac{-16}{22}=\frac{-8}{11}\)

\(\frac{-23}{7}-\frac{31}{7}=\frac{-23-31}{7}=\frac{-54}{7}\)