a, (135,6 - 78,9) : 2,5 + 3,39 x 3

= 56,7 : 2,5 + 10,17

= 22,68 + 10,17

= 32,85

b, 5,67 : (1,28 + 1,72) + 2015

= 5,67 : 3 + 2015

= 1,89 + 2015

= 2016,89

Tính :

a . \(\left(135,6-78,9\right)\div2,5+3,39\times3\) 

 \(=56,7\div2,5+3,39\times3\)

\(=22,68+10,17\)

\(=32,85\)

b . \(5,67\div\left(1,28+1,72\right)+2015\)

\(=5,67\div3+2015\)

\(=1,89+2015\)

\(=2016,89\)

a, (135,6 - 78,9) : 2,5 + 3,39 x 3

= 56,7 : 2,5 + 10,17

= 22,68 + 10,17

= 32,85

b, 5,67 : (1,28 + 1,72) + 2015

= 5,67 : 3 + 2015

= 1,89 + 2015

= 2016,89

a) đề bài nhé                                                                                                                                              = 56,7  :   2,5  +  10,17

=      22,68   +   10,17

=           32,85 

b) đề bài luôn 

= 5,67 :  3  +  2015

=   1,89    +   2015

=      2016,89

(5x+6):(x+3)

=(5x+15-9)/x+3

=5-9/x+3

\(\left(5^2.2^3-7^3.2\right):\left(2.6-7:2^5\right)\\ =\left(25.8-343.2\right):\left(12-7:32\right)\\ =\left(200-686\right):\left(12-\dfrac{7}{32}\right)\\ =-486:\dfrac{377}{32}=-486.\dfrac{32}{377}=-\dfrac{15552}{377}\)

(5^2*2^3-7^3*2):2*6-7:2^5

=(25*8-343*2):3-7/32

=-162-7/32=-5191/32

11 x ( X - 6 ) = 4 x X + 6.Tìm x

(3 x 8) : (7 x 2)

= 24 ; 14

=12/7

a: =7/8:(2/9-18+1/36)-5/12

=-7/142-5/12=-397/852

b: =3/7(4/9+5/9:6/12)=2/3

c: =5^8(16/31-47/31)+1/3=-5^8+1/3

d: =7/2(3/8+5/8:4/15)=609/64