a, 28 . (-2).3 - { 136 + [54 - 28 : (69 - 71).2 ]}

=-168- { 136 + [54 - 28 : (-2).2 ]}

=-168 - [136 + (54+28)]

=-168 - 218

=-386

b) 203.46-203.37+203

=203.46-203.37+203.1

=203.(46-37+1)

=203.10

=2030

c)21+23+25+27+29-31-33-35-37-39

=(21-31)+(23-33)+(25-35)+(27-37)+(29-39)

= -10 + (-10) + (-10) + (-10) + (-10)

=-50

d) 18.17-3.6.17

=18.17-18.17

= 0

e,33. ( 107- 112) - 107 . ( 33- 112)

=33.107- 33.112- 107.33+107.112

=(33.107- 33.112- 107.33)+107.112

=33(107-112-107)+107.112

=-33.112+107.112

=112.(-33+107)

=112.74

=8288

CHÚC BẠN MAY MẮN

= 119 

tk mk nha bn 

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

119 ( k mik đi ạ )

21/54 + 3/75 :  (39/65) + 29/200 - ( 33/600 ) : 21/9 / 7^2 - 73/4 + 41/12 - 97/6 

= 21/54 + 3/75 :  (39/65) + 29/200 - 33/600 . 9/21 / 49 - 73/4 + 41/12 - 97/6

= 21/54 + 3/75 : 149/200 - 33/1400 / 49 - 73/4 + ( -51/4 )

= 21/54 + 3/75 : 101/140 / 123/4 + ( -51/4 )  

= 21/54 + 3/75 : 101/140 /  18

= 21/54 + 3/75 : 101/140 . 1/18

= 21/54 + 3/75 : 101/2520

= 21/54 + 3/75 . 2520/101

= 21/54 + 504/505

Tim hai so tu nhiên a,b  toa man dieu kien a+2b=48 va (a,b)+3=144

Bài làm :

\(a,35.34+35.38+65.75+65.45\)

\(=35.\left(34+38\right)+65.\left(74+45\right)\)

\(=35.72+65.120\)

\(=2520+780\)

\(=10320\)

\(b,39.8+60.2+21.8\)

\(=\left(39+21\right).8+60.2\)

\(=60.8+60.2\)

\(=60.\left(8+2\right)\)

\(=60.10=600\)

\(c,36.28+36.82+64.69+64.4\)

\(=36.\left(28+82\right)+64.\left(69+4\right)\)

\(=36.110+64.73\)

\(=3960+4672\)

\(=8632\)

\(d,123.1001\)

\(=123123\)

Học tốt

p=2,316988801

a) 300

b) -3775

c) - 1615

c có k cho mik k

-2017

-26914

480

-450

1) - 135 - 2017 + 9 x 15

= - 135 - 2017 + 135

= ( - 135 + 135 ) - 2017

= 0 - 2017

= - 2017

2) - 39 x ( 250 - 87 ) - 61 x ( 240 + 97 )

= - 39 x 163 - 61 x 337

= - 6357 - 20557

= - 26914

3) 65 + 135 - 35 + 9 x 35

= 65 + 135 - 35 + 315

= ( 65 + 315 ) + ( 135 - 35 )

= 380 + 100

= 480

4) - 15 x ( 23 + 157 ) + 15 x 157 - 15 x 7

= 15 x ( - 180 ) + 15 x 157 - 15 x 7 

= 15 x ( - 180 + 157 - 7 )

= 15 x ( - 30 )

= - 450