Question

[vũ ngọc bảo châm]

1)17-2 (2x-3)=3                      2)125-5 (3x-1)=25

3)70-5(2x-3)=45                     4)231-(x-6)=133:13

5)2448 : [119- (x-6)]=24          6)15x-13x=882

7)[ (6x-72):2-84].28=5628       8)100-4(30-5x)=20

Answer 1

[Rinu]

Trả lời

1)17-2(2x-3)=3

        2(2x-3)=17-3

        2(2x-3)=14

           2x-3 =14:2

           2x-3 =7

           2x     =7+3

           2x     =10

            x      =10:2

           x       =5

Answer 2

[Edogawa Conan]

1) 17 - 2(2x - 3) = 3

=> 17 - 4x + 6 = 3

=>  23 - 4x = 3

=> 4x = 23 - 3

=> 4x = 20

=> x = 20 : 4 = 5

2) 125  - 5(3x - 1) = 25

=> 125 - 15x + 5 = 25

=> 130 - 15x = 25

=> 15x = 130 - 25

=> 15x = 105

=> x = 105 : 15

=> x = 7

3) 70 - 5(2x - 3) = 45

=> 70 - 10x + 15 = 45

=> 85 - 10x = 45

=> 10x = 85 - 45

=> 10x = 40

=> x = 40 : 10

=> x = 4

4) 231 - (x - 6) = 133 : 13

=> 231 - x + 6 = 133/13

=> 237 - x = 133/13

=> x = 237 - 133/13

=> x = 2948/13