Предмет: Алгебра, автор: seimyrsasna1980

определить знак пройзведения. 13*(-15)*(-3)*(-4)*(-6)*(-20)*80*90 ....2)15*(-7.2)*(-7.1)*(-3.7)*(-7.6)*71*43*84*4.2 помогите пожалуйсста
-4*(-8)*(-1)*(-8.7)*31*(-4.8)*(-1.1)
(-3.1)*8*(-12.7)*3.2*60*54*13*(-4.2)*21
упростите выражения
a-23+40-a
50-x-94+y+x
решите уравнения используя свойства пройзведенного равно нулю
-4*(3.4+х)=0
(х-2)*(х+5)=0

Ответы

Автор ответа: mariaplaksina15
2

Ответ:

13*(-15)*(-3)*(-4)*(-6)*(-20)*80*90 Минус

15*(-7.2)*(-7.1)*(-3.7)*(-7.6)*71*43*84*4.2 Плюс

-4*(-8)*(-1)*(-8.7)*31*(-4.8)*(-1.1) Плюс

(-3.1)*8*(-12.7)*3.2*60*54*13*(-4.2)*21 Минус

a-23+40-a = 17

50-x-94+y+x = у - 44

-4*(3.4+х)=0

3.4+х=0

х=-3.4

(х-2)*(х+5)=0

х-2=0

х=2

х+5=0

х=-5

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