\(H=\frac{4}{15}-\frac{23}{28}-\left(-\frac{23}{28}+\frac{-11}{15}-\frac{24}{27}\right)-\frac{2}{27}\)

\(H=\frac{4}{15}+\frac{-23}{28}+\frac{23}{28}+\frac{11}{15}+\frac{24}{27}+\frac{-2}{27}\)

\(H=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{-23}{28}+\frac{23}{28}\right)+\left(\frac{24}{27}+\frac{-2}{27}\right)\)

\(H=1+0+\frac{22}{27}\)

\(H=1+\frac{22}{27}\)

\(H=\frac{27}{27}+\frac{22}{27}=\frac{49}{27}\)

\(H=\frac{4}{15}-\frac{23}{28}-\left(\frac{-23}{28}+\frac{-11}{15}-\frac{24}{27}\right)-\frac{2}{27}\)

\(H=\frac{4}{15}-\frac{23}{28}+\frac{23}{28}+\frac{11}{15}+\frac{24}{27}-\frac{2}{27}\)

\(H=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{-23}{28}+\frac{23}{28}\right)+\left(\frac{24}{27}-\frac{2}{27}\right)\)

\(H=1+0+\frac{22}{27}\)

\(H=\frac{49}{27}\)

a,  15 . { 32 : [ 6 - 5 + 5 ( 9 : 3 ) ] + 3 } - 2018 0

= 15.{32:[1+15]+3}–1

= 15.5–1

= 74

b,  25 . { 2 7 : [ 12 - 4 + 2 2 . 16 : 2 3 ] - 2 4 }

= 25.{128:[8+4.2]–16}

= 25.24

= 600

c,  2019 . { 101 - 1000 : [ 2 2 . 2 3 + 5 6 : 5 3 - 6 2 : 11 - 2018 0 ] }

= 2019.{101–1000:[(32+125–36):11–1]}

= 2019.{101–1000:[121:11–1]}

= 2019.{101–1000:10}

= 2019.1

= 2019

a) (-8).72 + 8.(-19) - (-8)

= (-8).72 + (-8).19 - (-8).1 

= (-8).(72 + 19 - 1)

= (-8).90

= -720

b) (-27).1011 -  27.(-12) + 27.(-1)

= 27.(-1011) - 27.(-12) + 27.(-1)

= 27.(-1011 + 12 - 1)

= 27.(-1 000)

= -27 000

a) (-8).72 + 8.(-19) - (-8).

= (-8).72 + (-8).19 - (-8).

= -8.(72 + 19 - 1).

= (-8).(71 + 19).

= (-8). 90 = -720.

b) (-27).1011 - 27.(-12) + 27. (-1).

= (-27).1011 - (-27).12 + (-27).1.

= (-27).(1011 - 12 + 1).

= (-27).(1012 -12).

= (-27).1000.

= -27000.

a) (-8).72 + 8.(-19) - (-8).

= (-8).72 + (-8).19 - (-8).

= -8.(72 + 19 - 1).

= (-8).(71 + 19).

= (-8). 90 = -720.

b) (-27).1011 - 27.(-12) + 27. (-1).

= (-27).1011 - (-27).12 + (-27).1.

= (-27).(1011 - 12 + 1).

= (-27).(1012 -12).

= (-27).1000.

= -27000.

a: 15 mod 2=1

b: 27 div 5=5

c: 17 mod 3=2

d: 21 div 2=10

e: 10 mod 4=2

f: 23 div 5=4

\(a.23+\left(-13\right)=23-13=10\)

\(\left(-23\right)+13=\left(-23\right)-\left(-13\right)=-10\)

\(Vì:10>-10\)

\(\Rightarrow23+\left(-13\right)>\left(-23\right)+13\)

Câu b tương tự

a) Ta có:

C = 5/18 + 8/19 - 7/21 + (-10/36 + 11/19 + 1/3) - 5/8

C = 5/18 + 8/19 - 1/3 - 5/18 + 11/19 + 1/3 - 5/8

C = (5/18 - 5/18) + (8/19 + 11/19) - (1/3  - 1/3) - 5/8

C = 1 - 5/8

c = 3/8

b) F = 15/14 - (17/23 - 80/87 + 5/4) + (17/23 - 15/14 + 1/4)

F = 15/14 - 17/23 + 80/87 - 5/4 + 17/23 - 15/14 + 1/4

F = (15/14 - 15/14) - (17/23 - 17/23) + 80/87 - (5/4 - 1/4)

F = 80/87 - 1

F = -7/87

c) G = 1/25 - 4/27 + (-23/27 + -1/25 - 5/43) + 5/43 - 4/7

G = 1/25 - 4/27 - 23/27 - 1/25 - 5/43 + 5/43 - 4/7

G = (1/25 - 1/25) - (4/27 + 23/27) - (5/43 - 5/43) - 4/7

G = -1 - 4/7 = -11/7

= 16 nha 

=16 nha

\(\frac{2^{19}.27^3+15^4.4^9.9^4}{6^9.2^{10}+12^{10}}\)

\(=\frac{2^{19}.\left(3^3\right)^3+\left(3.5\right)^4.\left(2^2\right)^9.\left(3^2\right)^4}{\left(2.3\right)^9.2^{10}+\left(2^2.3\right)^{10}}\)

\(=\frac{2^{19}.3^9+3^{12}.5^4.2^{18}}{2^{19}.3^9+2^{20}.3^{10}}\)

\(=\frac{2^{18}.3^9.\left(2+3^3+5^4\right)}{2^{19}.3^9.\left(1+2+3\right)}\)

\(=\frac{654}{2.6}\)

\(=\frac{109}{2}\)

Chúc bn học tốt !!!!