Question

a) [(x+34)] - 50] . 2 = 56

b) 1045 - [ 215 - ( 3x - 24 )] = 5

c) [ 195 - ( 15x - 27)] . 39 = 4212

giải bằng cách phá ngoặc và dồn cho số tự do 1 bên x 1 bên.

 

Answer 1

\(a.\left[\left(x+34\right)-50\right].2=56\\ \Leftrightarrow\left(x+34\right)-50=28\\ \Leftrightarrow x+34=78\\ \Rightarrow x=44\)

\(b.1045-\left[215-\left(3x-24\right)\right]=5\\ \Leftrightarrow215-\left(3x-24\right)=1040\\ \Leftrightarrow3x-24=-825\\ \Leftrightarrow3x=-801\\ \Rightarrow x=-267\)

\(c.\left[195-\left(15x-27\right)\right].39=4212\\ \Leftrightarrow195-\left(15x-27\right)=108\\ \Leftrightarrow15x-27=87\\ \Leftrightarrow15x=114\\ \Rightarrow x=7,6\)

 

Answer 2

a) [(x+34)] - 50] . 2 = 56

=x+34-50=56:2

=> x+34-50=28

->x=28+50-34

-> x=44

b,1045 - [ 215 - ( 3x - 24 )] = 5

1045-(215-3x+24)=5

1045-215+3x-24=5

1045-215-24-5=-3x

-> 801=-3x-> x=801:(-3)=-267

,c) [ 195 - ( 15x - 27)] . 39 = 4212

(195-15x+27).39=4212

(195-15x+27)=4212/39=108

195+27-108=15x

114=15x-> x=114/15=7,6

 

-

Answer 3

a) [(x+34)] - 50] . 2 = 56

(x+34)] - 50=56:2

(x+34)] - 50=28

(x+34)=28+50

x+34=78

x=78-34

x=44

Vậy...

câu b có sai đề bài ko vậy

 

Answer 4

a) [(x+34)] - 50] . 2 = 56

=x+34-50=56:2

=> x+34-50=28

->x=28+50-34

-> x=44

b,1045 - [ 215 - ( 3x - 24 )] = 5

1045-(215-3x+24)=5

1045-215+3x-24=5

1045-215-24-5=-3x

-> 801=-3x-> x=801:(-3)=-267

,c) [ 195 - ( 15x - 27)] . 39 = 4212

(195-15x+27).39=4212

(195-15x+27)=4212/39=108

195+27-108=15x

114=15x-> x=114/15=7,6