Предмет: Математика, автор: slavanov11

чему равен корень уравнения
1) 3x=28-x
2)5x+12=8x+30
3)33+8x=-5x+72
решите пожалуйста три действия

filpopov2012: это нужно найти чему х равен?
slavanov11: ну чему равен корень
3BEPb16: 1.3х+x=28;4х=28х=7)))))))2.5х-8х=30-12;-3х=18;х=6))))))))3.8х+5х=72-33;13х=39;х=3))))
Дарьюшка6641: во 2-ом будет -6
3BEPb16: Даша ты права сорри ошибся

Ответы

Автор ответа: Дарьюшка6641
4
1)3х=28-x
3х+х=28
4х=28
х=7

2)5x+12=8x+30
5х-8х=30-12
-3х=18
х=18:(-3)
х=-6

3)33+8x=-5x+72 
8х+5х=72-33
13х=39
х=39:13
х=3
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