Вопрос школьника по предмету Математика
Решите уравнения.
а) (2х+1)+3х=11
х=?
б) (х-5)-(2-2х)=6
х=?
в) (4х-1)-(3х+1)=2
х=?
г) -(3х+5)+(4-7х)=4
х+?
Помогите пожалуйста напишите решение просто ответы знаю
Ответ учителя по предмету Математика
а)
(2x+1)+3x=11
2x+1+3x=11
5x+1=11
5x=11-1
5x=10
x=2
Ответ: 2
Б) (x-5)-(2-2x)=6
x-5-2+2x=6
3x-7=6
3x=6+7
3x=13
x=13/3
Ответ:
13/3
В) (4x-1)-(3x+1)=2
4x-1-3x-1=2
x-2=2
x=2+2
x=4
Ответ: 4
Г) -(3x+5)+(4-7x)=4
-(3x+5)+4-7x=4
-3x-5-7x=0
-10x-5=0
-10x=5
x=-0.5
Ответ: -0.5
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