Question

Va rog Efectuati si mie pe 19 va rog !!!


Si pe 20000000000000 va rogggvb

Dau coroana

Answer 1

19. A) (-4).(-213).(25)

= (-4).(-25).(-213)

=200.(-213)

= -42600

B) 15.(-117).(-2)

=(-2).15.(-117)

= -30.(-117)

= 3510

C) (-2).37.(+4).(-125)

= -74.(-500)

= 37000

D) +50.(-17).(-200).(-3)

= 50.(-3).(-200).(-17)

= - 150.(200).(-17)

= -30000.(-17)

= 510000

E) (-5).(-217).(-4).(-10)

= (-5).(-4).(-10).(-217)

= 20.(-10).(-217)

= -200.(-217)

= 43400

F) (-15).313.(-8).(-20)

= (-8).(-20).(-15).313

= 160.(-15).313

= -2400.313

= -751200

Ex20

A) ab+ac=8

B+c= -4

Ab+ac=8

2a+b+c=8

2a+(-4)=8

2a-4=8

2a=8+4

2a=12

A=12:2=6

Verificare

Ab+ac=8

2a+b+c=8

2x6(-4)=8

12-4=8

8=8

B)ab+ac=12

A= -2

B+c=?

2a+b+c=12

2.(-2)+b+c=12

-4+b+c=12

B+c=12+4

B+c=16

Verificare

Ab+ac=12

2(-2)+16=12

-4+16=12

12=12