\(\left(\frac{8}{12}+\frac{9}{12}\right)x=\frac{35}{12}\)

\(\frac{17}{12}x=\frac{35}{12}\)

\(x=\frac{35}{12}:\frac{17}{12}\)

\(x=\frac{35}{17}\)

B

b

b

3 x 125 x 8 + 4 x 24 x 35 + 4 x 35 x 2 x 12

= 375 x 8 + 96 x 35 + 140 x 24

= 3000 + 3360 + 3360

= 3000 + 3360 x 2

= 3000 + 6720

= 9720

ket qua 1055

đáp số:9720

`\text {12 ngày 8 giờ - 2 ngày 15 giờ x 3 = 12 ngày 8 giờ - 7 ngày 21 giờ = 4 ngày 11 giờ}` 

`11/12 \times 5/6 \times 4/3=55/72 \times 43=55/54`

`5/7+3/8 \div 9/2=5/7+1/12=67/84`

a: x=-11

b: x=4

\(a,\Rightarrow x=-8-3=-11\\ b,\Rightarrow35+x-12=27\\ \Rightarrow x=4\\ c,\Rightarrow2^x=16=2^4\Rightarrow x=4\)

a/ \(3+x=-8\Rightarrow x=-8-3=-11\)

b/ \(\begin{matrix}\left(35+x\right)-12=27\\35+x=27+12\\35+x=39\\x=39-35\\x=4\end{matrix}\)

c/ \(\begin{matrix}2^x+15=31\\2^x=31-15\\2^x=16\\2^x=2^4\\x=4\end{matrix}\)

a) (3x-12) :8 +10= 13

<=> (3x-12):8 = 13-10 = 3

<=> 3x-12 = 3 .8 = 24

<=> 3x = 24+12=36

<=> x=36:3=12

b) (x+5).8-20 = 60

<=> (x+5) .8 = 60+20=80

<=> x+5 = 80:8 = 10

<=> x=10-5 = 5

c) 3.[35+(x-10)]-375 = 0

<=> 3.[35+(x-10)] = 0 +375=375

<=> 35+(x-10) = 375 :3 = 125

<=> x-10 = 125-35=90

<=> x = 90+10 = 100

d) ( 158x+173-24) :35 = 81

<=> 158x+149 = 81 . 35 = 2835

<=> 158x = 2835 -149= 2686

<=> x= 2686 : 158 = 17

e) x - 140 : 35 = 0

<=> x-4 = 0

<=> x=0+4 = 4

(3x - 12 ) : 8 + 10 = 13 

(3x - 12 ) : 8 = 13 - 10 = 3

(3x - 12 ) = 3 x 8 = 24

3x = 24 - 12 = 12

x =13 : 3 = 4

( x + 5 ) 

b: =>6/x-8/11>0

=>\(\dfrac{66-8x}{11x}>0\)

=>\(\dfrac{8x-66}{11x}< 0\)

=>0<x<66/8=8,25

=>\(x\in\left\{1;2;3;4;...;7;8\right\}\)

c: =>5x/35<12/35

=>5x<12

=>\(x\in\left\{0;1;2\right\}\)

a, x = -8 - 3 = -11

b, 35 + x = 27 + 12 = 39

=> x = 39 - 35 = 4

c, 2^x = 31 - 15 = 16 

=> x = 4

\(a\)) \(3+x=-8\)

\(x=-8-3\)

\(x=-11\)