(49+56):x=7

105:x=7

x=15

x=15 nha bạn

49:x+56:x=7

<=>(49+56):x=7

<=>105:x=7

=>x=105:7

=>x=15

a: x=27

a: x=27

a) 15 b)100

giup mình với

Sai rùi bạn

49 ko chia hết cho 15

90 ko chia hết cho 100

a) 12x + 69 - 23 = 109

12x + 46 = 109

12x = 63

x = 21/4 

b) 56/x + 49 = 7

56/x = -42

x = 56/-42 

x = -4/3 

12x+69-23=109

12x+69=109+23

12x+69=132

12x-132-69

12x=63

x=63/12

x=21/4

56/x+49=7

x+49=56/7

x+49=8

x=8-49

x=-41

kick nha minh nhanh nhat

\(12x+69-23=109\)

\(\Rightarrow12x+46=109\)

\(\Rightarrow12x=63\)

\(\Rightarrow x=\frac{63}{12}\)

\(\Rightarrow x=5,25\)

b) \(\frac{56}{x}+49=7\)

\(\Rightarrow\frac{56}{x}=-42\)

\(\Rightarrow-42x=56\)

\(\Rightarrow x=\frac{-4}{3}\)

a) 15

b) 100

a) 15

b) 100 

~HT~

k cho mik nha

\(a,49:x+56:x=7\)

\(\Rightarrow\left(49+56\right):x=7\)

\(\Rightarrow105:x=7\)

\(\Rightarrow x=15\)

Vậy: \(x=15\)

\(b,390:x-90:x=3\)

\(\Rightarrow\left(390-90\right):x=3\)

\(\Rightarrow300:x=3\)

\(\Rightarrow x=100\)

Vậy: \(x=100\)

49 : x + 56 : x = 7

(49 + 56) : x = 7

105 : x = 7

X = 105 : 7

X = 15

Vậy x = 15

49 : X + 56 : X = 7

(49 + 56) : X    = 7

 105 : X           = 7

          X           = 105 :7 

          X           = 15

Vậy X = 15

Đúng nha em !

\(49:x+56:x=7\)

\(\left(49+56\right):x=7\)

\(105:x=7\)

\(x=105:7\)

\(x=15\)

Vậy \(x=15\)

7 x 8 = 56

7 x 9 = 63

7 x 6 = 42

7 x 7 = 49

56 : 7 = 8

63 : 7 = 9

42 : 7 = 6

49 : 7 = 7