= 119 

tk mk nha bn 

thanks @@@@@@@@@@@@@@@@

119 ( k mik đi ạ )

b: 29/36=58/72=1-14/72

25/39=1-14/39

14/72<14/39

=>-14/72>-14/39

=>1-14/72>1-14/39

=>29/36>25/39

=>-29/36<-25/39

a: 21/36<24/36

=>21/36<2/3

=>21/36<26/39

mà 26/39<26/35

nên 21/36<26/35

thanks bạn nhé

140

giúp tớ nhé

tớ bị trừ 590 điểm

cảm ơn trước 

số đó là 

25+25+36+25+36+29

=140

ai k tui 

tui k lại cho

Không biết tính ak? Lười! Máy tính âu?

hỏi cho vui

alo 

a) \(-75+\left(-325\right)+\left|-45\right|-\left(-125\right)\)

\(=-75-325+45+125\)

\(=\left(45+125\right)-\left(75+325\right)\)

\(=170-400\)

\(=-230\)

b) \(62+\left|128\right|-\left|-155\right|-\left|70\right|\)

\(=62+128-155-70\)

\(\Leftrightarrow190-225\)

\(=-35\)

c) \(815+\left[95+\left(-815\right)+\left(-45\right)\right]\)

\(=815+95-815-45\)

\(=\left(815-815\right)+\left(95-45\right)\)

\(=0+50\)

\(=50\)

d) \(5+\left(-7\right)+9+\left(-11\right)+...+25+\left(-27\right)\)

\(=\left(5-7\right)+\left(9-11\right)+...+\left(25-27\right)\)

\(=-2-2-...-2\)

\(=-2.11\)

\(=-22\)

e) \(34+35+36+37-24-25-26-27\)

\(=\left(34-24\right)+\left(35-25\right)+\left(36-26\right)+\left(37-27\right)\)

\(=10+10+10+10\)

\(=40\)

b: \(1024:2^5+140:\left(38+2^5\right)+2\cdot3^2-7^{23}:7^{21}\)

\(=1024:32+140:\left(38+32\right)+2\cdot9-7^2\)

=32+140:70+18-49

=50-49+2

=1+2

=3

c: \(100:\left\lbrace300:\left\lbrack450-\left(4\cdot5^3-2^3\cdot25\right)\right\rbrack\right\rbrace\)

\(=100:\left\lbrace300:\left\lbrack450-\left(4\cdot125-8\cdot25\right)\right\rbrack\right\rbrace\)

\(=100:\left\lbrace300:\left\lbrack450-\left(500-200\right)\right\rbrack\right\rbrace\)

=100:{300:[450-300]}

=100:{300:150}

=100:2

=50

3: =231+26-209-26=22

4: =19(25+30+45)=19x100=1900

5: =-50+19+143+79-25-48

=-75+95+98

=98+20=118