âm 2( số -2) và 4/25

\(\frac{-3}{31}+\frac{-6}{17}+\frac{1}{25}+\frac{-28}{31}+\frac{-11}{17}+\frac{-1}{5}\)

\(=\left(\frac{-3}{31}+\frac{-28}{31}\right)+\left(\frac{-6}{17}+\frac{-11}{17}\right)+\left(\frac{1}{25}+\frac{-1}{5}\right)\)

\(=\frac{-31}{31}+\frac{-17}{17}+\frac{-4}{25}\)

\(=\left(-1\right)+\left(-1\right)+\frac{-4}{25}\)

\(=\frac{\left(-25\right)+\left(-25\right)+\left(-4\right)}{25}\)

\(=\frac{-54}{25}\)

(-3/31+-28/31)+(6/17+11/17)+1/25+-1/5

-1+-1+1/25 +-1/5

-2+1/25+-1/5

-2/1+1/25+-1/5

-50/25+1/25+-5/25

-49/25+-5/25

-54/25

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e/ = -561

f/ = -1350

g/ = -80

tích nha..^.^...♥

67,35

NHO K MINH NHA

67.35

____________________

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19.25 + 9.95 + 38.15 = (19.25 + 9.95) + 38.15

                                  = 29.2 + 38.15

                                  = 67.35

a: =-39*5+39*99+99*10-99*39

=-39*5+99*10

=990-195=795

b: =153(177-77)=15300

c: =199*15-199*17+99*17-99*5

=17(-100)+199*15-99*5

=790

d: =73*18-73*59-59*8+59*73

=73*18-59*8

=842

a.18.17-3.6.7
 =18.17-18.7
 =18.(17-7)
 =18.10=180
b.54-6.(17+9)
 =54-6.26
 =54-156=-102
c.33.(17-5)-17.(33-5)
 =33.17-33.5-17.33+17.5
 =33.5+17.5
 =(33+17).5
 =50.5=250

a)   \(18.17-3.6.7\)

\(=18.17-18.7\)

\(=18\left(17-7\right)\)

\(=18.10=180\)

c)   \(33\left(17-5\right)-17.\left(33-5\right)\)

\(=33.17-33.5-17.33+5.17\)

\(=5\left(17-33\right)\)

\(=5.\left(-16\right)=-80\)

a, 18.17-3.6.7            b,54-6.(17+5)      c,33.(17.5)-17.(33-5)

=18.17-18.7               =6.9-6.22            =33.17.5-17.(33-5)

=18.(17-17)                =6.(9-22)            =17.(33.5)-17.(33-5)

=18.10                        =6.(-13)              =17.165-17.28        

=18.10                        =6.(-13)              =17.(165-28)

=180                           =-78                    =17.137

                                                              =2329

a, \(\left(\frac{1}{5}-\frac{1}{4}\right)^2=\left(\frac{-1}{20}\right)^2=\frac{1}{400}\)

b, \(\left(\frac{5}{3}+\frac{1}{2}\right):\frac{-13}{5}+1\frac{5}{6}\)

=> \(\frac{13}{6}:\frac{-13}{5}+\frac{11}{6}\)

=> \(\frac{13}{6}.\frac{5}{-13}+\frac{11}{6}\)

=> \(\frac{-5}{6}+\frac{11}{6}=\frac{6}{6}=1\)

c, \(\left(\frac{3}{17}\right)^4.\left(\frac{-17}{6}\right)^4\)

=> \(\left(\frac{3}{17}.\frac{-17}{6}\right)^4=\left(\frac{-1}{2}\right)^4=\frac{1}{16}\)

đúng 100%

a) \(\left(\frac{1}{5}-\frac{1}{4}\right)^2=\left(-\frac{1}{20}\right)^2=\frac{1}{400}.\)

b) \(\left(\frac{5}{3}+\frac{1}{2}\right):-\frac{13}{5}+1\frac{5}{6}\)

= \(\frac{13}{6}:\left(-\frac{13}{5}\right)+\frac{11}{6}\)

= \(\left(-\frac{5}{6}\right)+\frac{11}{6}\)

= \(1.\)

c) \(\left(\frac{3}{17}\right)^4.\left(-\frac{17}{6}\right)^4\)

= \(\left[\frac{3}{17}.\left(-\frac{17}{6}\right)\right]^4\)

= \(\left(-\frac{1}{2}\right)^4=\frac{1}{16}.\)

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