Question

15.x + 16.x - 21.x - 70 = 30

Answer 1

15.x + 16.x - 21.x - 70 = 30

=> x(15 + 16 - 21) - 70 = 30

=> x.10 = 100

=> x = 100 : 10

=> x = 10

vậy_

Answer 2

\(15x+16x-21x-70=30\)

\(\Leftrightarrow x\left(15+16-21\right)=30+70\)

\(\Leftrightarrow10x=100\)

\(\Leftrightarrow x=100:10\)

\(\Leftrightarrow x=10\)

Vậy x=10

Answer 3

dễ thế mà ko làm được

Answer 4

15x +16x -21x-70=30

10x -70=30

10x=100

x=10

=.= hok tốt!!

Answer 5

15x + 16x - 21x - 70 = 30

x( 15 + 16 - 21 ) = 30 + 70

x * 10 = 100

x = 100 : 10 

x= 10

hok tốt ....

Answer 6

15.x+16.x-21.x=30+70

x.(15+16-21)=100

x.(31-21)=100

10.x=100

x=100:10

x=10

Answer 7

15x + 16x - 21x - 70 = 30

=> 31x - 21x - 70 = 30

=> 10x = 100

=> x = 10

Answer 8

\(15x+16x-21x-70=30\)

\(\left(15+16-21\right)x=100\)

\(10x=100\)

\(x=10\)

Answer 9

Ta có \(15x+16x-21x-70=30\)

\(\Rightarrow15x+16x-21x=30+70\)

\(\Rightarrow15x+16x-21x=100\)

\(\Rightarrow x.\left(15+16-21\right)=100\)

\(\Rightarrow x.10=100\)

\(\Rightarrow x=10\)

Vậy x = 10

Answer 10

15 . x + 16 . x - 21 . x - 70 = 30 

15 . x + 16 . x - 21  . x = 30 + 79 

x . ( 15 + 16 - 21 ) = 100

x . 10 = 100 

x = 100 : 10 

x = 10 

Vậy x = 10

Answer 11

\(15x+16x-21x-70=30\)

\(\Rightarrow\left(15+16-21\right)x=30+70\)

\(\Rightarrow10x=100\)

\(\Rightarrow x=100:10\)

\(\Rightarrow x=10\)

Vậy x = 10

_Chúc bạn học tốt_