\(a,x:\left(111-99\right)=17\cdot5\\ \Leftrightarrow x:12=85\\ \Leftrightarrow x=1020\\ b,\left(509+335\right):x=840:35\\ \Leftrightarrow844:x=24\\ \Leftrightarrow x=\dfrac{211}{6}\\ c,\left(x+1\right)+\left(x+2\right)+...+\left(x+28\right)=462\\ \Leftrightarrow28x+406=462\\ \Leftrightarrow28x=56\\ \Leftrightarrow x=2\)

d, 890 : x = 35 dư 15

\(\Rightarrow35x+15=890\\ \Leftrightarrow35x=875\\ \Leftrightarrow x=25\)

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 ) 

890 : x = 35 (dư 15)

=> 890 - 15 = 35 . x

=> 35 . x = 875

=> x = 875 : 35

=> x = 25

Vậy x = 25

Ủng hộ mk nha ^_-

890 : x = 35 ( dư 15 )

x = ( 890 - 15 ) : 35

x = 25

890 : x = 35 dư 15 

35.x=890-15

35.x=875

x=25

t nhé

suy ra 890=35*x+15

35xX=890-15=875

x=875/35=25

vậy x=25

ta có : X = (890-15):35=875:35=25

Vậy x=25

890:x=35 dư 5

=>x=890:35+5

=> đề sai

vi 890 : x = 35 du 15

nen 890 : x = 35 +15 hay 890 : x = 50

vay x = 890 : 50

x = 17.8

Ta có: 890:x=35 [dư 15] 

         [890-15] :x=35

              875 : x = 35 

                      x = 875:35

                      x = 25

Cho mình

monkey d luffy sai rồi

890:x=35 dư 15

=> 890=35x+15

890-15=35x

875=35x

875:35=x

x=25

890:x=35 dư 5=>890-5=35 x X

=>35 x X=885

=> X =\(\frac{177}{7}\)

=> ( 890 - 15 ) : x = 35

=> 875  : x = 35

=> x= 25

890 : x = 35 ( dư 15 )

         x = ( 890 -15 ) : 35

         x = 25

(890-15):x=35

875:x=35

x=875:35

x=25

Vậy x=25

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

 <=>(3x-12):8=3

<=>3x-12=24

<=>3x=36

<=>x=12

b/(x+5)x8-20=60

<=>(x+5)x8=80

<=>x+5=80:8

<=>x+5=10

x=5

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

<=>3x[35+(x-10)]=375

<=>35+(x+10)=125

<=>x+10=90

x=80

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

<=>158x+173-24=2835

<=>158x+173=2859

<=>158x=2686

<=>x=17

e/x-140:35=0

<=>x-140=0

<=>x=140+0

x=140

a)  ( 3x - 12 ) : 8 + 10 = 13

=>  (3x - 12) : 8 = 3

=>  3x - 12 = 24

=> 3x = 12

=> x = 4

a)  ( 3x - 12 ) : 8 + 10 = 13

=>  (3x - 12) : 8 = 3

=>  3x - 12 = 24

=> 3x = 12

=> x = 4