Предмет: Алгебра, автор: karpenkoviktoria930

срочно надо
1)-2(x-1)=-1-x
2)3(x+1,3)-7,2+0,8=4x+5(x-1,1)
второе особенно пожалуйста помогите
дам 20 баллов​

Ответы

Автор ответа: a072007aa
1

Ответ:

  - 2( x - 1) = 1 - x  \\ - 2x + 2 = 1 - x  \\ - 2x + x = 1 - 2 \\  - x =  - 1 \\ x = 1

3(x + 1.3) - 7.2 + 0.8 = 4x + 5(x - 1.1) \\ 3x + 3.9 - 6.4 = 4x + 5x - 5.5 \\ 3x - 4x  - 5x = 6.4 - 3.9 - 5.5 \\  - 6x =  - 3 \\ x = 0.5

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