Предмет: Математика, автор: Аноним

решите пожалуйста!
14(2х+5)=28(3х-1)
-3(y+2,5)=6,9-4,2y
3∣х∣+9=5∣х∣-5

Ответы

Автор ответа: Тинусичка
0
14(2х+5)=28(3х-1)          -3(у+2,5)=6,9-4,2у                3|x| + 9 = 5|x| - 5        
28х+70=84х-28               -3у-7,5=6,9-4,2у                   3 |x| - 5 |x| = -5 - 9
28х-84х= -28-70              -3у + 4,2у = 6,9 + 7,5           -2 |x| = -14
-56х= -98                          1,2у = 14,4                           |x| = -14 : (-2)
х = -98 : (-56)                    у = 14,4 : 1,2                        |x| = 7
х=1,75                               у = 12                                   x = 7   или   х = -7
Автор ответа: Аноним
0
спасибо большое)))
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