Предмет: Математика, автор: vladgryaznyy

Развяжите уравнение:

1) -0,3x+0,9=-4,2
2) (2-x) (x+3)=0

Ответы

Автор ответа: aalexandrova2007
1

Ответ:

1) -0,3x+0,9=-4,2

-0,3х= -4,2-0,9

-0,3х= -5,1

х= -5.1:(-0,3)

х=17

2) (2-x) (x+3)=0

x(x+3)=0

x=0 или x+3=0

x=0         x= -3

Пошаговое объяснение:

Автор ответа: sofiyavictoria
1

Ответ:

Пошаговое объяснение:

1). -0,3х+0,9=-4,2.   -0,3х=-4,2-0,9.  -0,3х=-5,1.   х=-5,1:(-0,3).   х=17

2). (2-х)*(х+3)=0

     2-х=0     или      х+3=0

      х=2        или      х=-3

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