a) 204 - 84 : 12

= 204 - 7

= 197

b) 15 . 2³ + 4 . 3² - 5 . 7

= 15 . 8 + 4 . 9 - 35

= 121.

c) 5⁶ : 5⁵ + 2³ . 2²

= 5 + 2⁵

= 37.

d) 164 . 53 + 47 . 164

= 164. (53 + 47)

= 164 . 100

= 16400.

a)

204 - 84 : 12

= 204 - ( 84 : 12 )

= 204 - 7

= 107

b)

15 . 2³ + 4 . 3² - 5 . 7

= 15 . 8 + 4 . 9 - 5 . 7 

= 120 + 36 - 35

= 156 - 35

= 121

c)

5⁶ : 5³ + 2³ . 2² 

= 5^(6-3) + 2⁽³⁺²⁾

= 5³ + 2⁵

= 125 + 32

= 157

d) 164 . 53 + 47 . 164

= 164 . ( 53 + 47 )

= 164 . 100

= 16400

a,198

b,51

c,157

d,1640

a=197

b=157

c=121

d=16400

a)197

b)157

c)121

d)16400

Mk ko ghi lại đề nhé

1 = \(350-4.19+4.7\)

\(=350-4.\left(19+7\right)\)

\(=350+4.26\)

\(=350-104=246\)

2 Câu này mình vẫn chưa hiểu là bạn ghi 27  3/5 tức là 27.3/5 hay 27\(\dfrac{3}{5}\)nên mk bỏ qua nhé

3 Cái đoạn 1 1/3 y chang câu 2 

4 \(=\dfrac{2}{3}+\dfrac{1}{3}.\dfrac{7}{18}.\dfrac{12}{7}\)

\(=\dfrac{2}{3}+\dfrac{7}{54}.\dfrac{12}{7}\)

\(=\dfrac{2}{3}+\dfrac{2}{9}=\dfrac{8}{9}\)

5 \(=2^2+10^2-\left[9.\left(112:8\right)-11\right].1\)

\(=4+100-\left(9.14-11\right)\)

\(=104-115\)\(=-11\)

6 Đoạn 6 3/5 y chang 2,3

7 \(=\left(\dfrac{2}{3}-1\right)+\left(\dfrac{2}{7}-\dfrac{3}{7}\right)-\left(\dfrac{1}{14}-\dfrac{3}{28}\right)\)

\(=\dfrac{-1}{3}+\dfrac{-1}{7}-\dfrac{-1}{28}\)

\(=\dfrac{-196}{588}+\dfrac{-84}{588}-\dfrac{-21}{588}\)\(=\dfrac{259}{588}\)

Làm tạm tạm thôi xl vì có 3 câu ko hiểu 

mik cách ra nghĩa là ghi 27, 3 phần 5 (mấy câu khác cx zị)hog phải nhân nha

1) (-25).8.(-4).(-125)

= [(-25).4].[(-125).8]

=(-100).(-1000)

=100000

2)30.(5-10)

=30.5-30.10

=30.5-300

=150-300

=(-150)

3) 43.(53-81)+53.(81-43)

=43.53-43.81+53.81-53.43

=(43.53-53.43)+(43.81-53.81)

=0+81.(43-53)

=(-810)

4) Mk chưa biết làm nha

1) (-25).8.(-4).(-125)

= [ (-25) . (-4) ] . [ 8 . (-125) ]

= 100 . (-1000)

= -100 000

2) 30.(-5-10)

= 30 . (-15)

= -450

3) 43.(53-81)+53.(81-43)

= 43 . 53 - 43 . 81 + 53 . 81 - 53.43

= -43 . 81 + 53 . 81

= 81 . ( -43 + 53)

= 81 . 10

= 810

4) (-6)².(-17)+23.(-36)-72.30

= 36 . (-17) + 23 . (-36) - 72. 30

= (-36) . 17 + 23 . (-36) - 72 . 30

= (-36) . ( 17 + 23 ) - 72 . 30

= (-36) . 40 - 72.30

=  (-1440 )- 2160

= -3600

# HOK TỐT #

a, 53.(-15)+(-15).47

=(-15)(53+47)

=(-15).100

=-1500

b, 43.(53-81)+53.(81-43)

=43.(-28)+53.38

=810

c,(-5).8+53.(81-43)

=-45+53.38

=1969

d, ban tu giai nốt

a,-15 . (53+47)

 = -15 . 100

=-1500

b,43.53-43.81+53.81-43.53

=(43.53-43.53)+81.(-43+53)

= 0 + 81.10

=0+810

=810

c,-40+-8

=-48

d,3.16+(-10)-20

=48+(-10)-20

=38-20

=18

\(a,\dfrac{5^{16}\cdot27^7}{125^5\cdot9^{11}}=\dfrac{5^{16}\cdot\left(3^3\right)^7}{\left(5^3\right)^5\cdot\left(3^2\right)^{11}}\)

\(=\dfrac{5^{16}\cdot3^{21}}{5^{15}\cdot3^{22}}=\dfrac{5}{3}\)

\(b,\left(-0,2\right)^2\cdot5-\dfrac{2^{13}\cdot27^3}{4^6\cdot9^5}\)

\(=0,04\cdot5-\dfrac{2^{13}\cdot\left(3^3\right)^3}{\left(2^2\right)^6\cdot\left(3^2\right)^5}\)

\(=0,2-\dfrac{2^{13}\cdot3^9}{2^{12}\cdot3^{10}}\)

\(=0,2-\dfrac{2}{3}\)

\(=-\dfrac{7}{15}\)

\(c,\dfrac{5^6+2^2\cdot25^3+2^3\cdot125^2}{26\cdot5^6}\)

\(=\dfrac{5^6+2^2\cdot\left(5^2\right)^3+2^3\cdot\left(5^3\right)^2}{5^6\cdot26}\)

\(=\dfrac{5^6+4\cdot5^6+8\cdot5^6}{5^6\cdot26}\)

\(=\dfrac{5^6\left(1+4+8\right)}{5^6\cdot26}\)

\(=\dfrac{13}{26}\)

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

#\(Toru\)

\(a,\dfrac{5^{16}.27^7}{125^5.9^{11}}=\dfrac{\left(5^2\right)^8.9^7.3^7}{25^5.5^5.9^{11}}\\ =\dfrac{25^8.9^7.\left(3^2\right)^3.3}{25^5.\left(5^2\right)^2.5.9^{11}}=\dfrac{25^8.9^7.9^3.3}{25^5.25^2.5.9^{11}}\\ =\dfrac{25^8.9^{10}.3}{25^7.5.9^{11}}=\dfrac{25^7.9^{10}.25.3}{25^7.9^{10}.5.9}\\ =\dfrac{25.3}{5.9}=\dfrac{5.5.3}{5.3.3}=\dfrac{5}{3}\)

a)\(\left(-3\right).8.\left(-2\right).5=\left(-3\right).\left(-2\right).8.5\)

                                          \(=6.40=240\)

b)\(127-18.\left(5+6\right)=127-18.11\)

                                             \(=127-198=-71\)

c)\(125-\left(-75\right)+32-\left(48+32\right)=125+75+32-48-32\)

                                                                              \(\left(125+75\right)+\left(32-32\right)-48=200-48=152\)

d)\(3.\left(-4\right).2+2.\left(-5\right)-20=-12.2+2.\left(-5\right)-20\)

                                                             \(=\left(-12-5\right).2-20=-17.2-20=-140-20=-160\)

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