Question

1)Scoateti factorul comun apoi efectuati:
a)48x35+48x65=
b)73x102-73x2=
c)479x2012-479x2000-479x12=
2)Daca axb+axc=144 si b+c=9,aflati a.
3)Daca axb-axc=500 si a=5, aflati b-c.
4)Daca axb+axc+a=260 si a=2,aflati b+c+1.
5)Daca axb-axc+3xa=45
si b-c+3+9, aflati a.
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Answer 1

a)48x35+48x65=48(35+65)=48x100=4800

b)73x102-73x2=73(102-2)=73x100=7300

c)479x2012-479x2000-479x12=479(2012-2000-12)=479x0=0

2)Daca axb+axc=144 si b+c=9,aflati a.
a(b+c)=144=>9a=144=.a=144:9=>a=16

3)Daca axb-axc=500 si a=5, aflati b-c.
a(b-c)=500=>5(b-c=500=>b-c=500:5=>b-c=100

4)Daca axb+axc+a=260 si a=2,aflati b+c+1.
a(b+c+1)=260=>2(b+c+1)=260=>b+c+1=260:2=>b+c+1=130

5)Daca axb-axc+3xa=45
si b-c+3=9, aflati a.
a(b-c+3)=45
9a=45=>a=45:9=>a=5

Answer 2

a)48x(35+65)=48x100=4.800
b) 73x(102-2)=73x100=7.300
c)479x(2012-2000-12)=479x0=0
2) axb+axc=144   ;  b+c=9
ax(b+c)=144
ax9=144
a=16
3) axb-axc=500   ; a=5
ax(b-c)=500
5x(b-c)=500
b-c=500:5
b-c=100
4) axb+axc+a=260   ;  a=2
ax(b+c)+a=260
2x(b+c)+2=260
2x(b+c)=260-2=258
b+c=258:2
b+c=129
b+c+1=129+1=130
5)  axb-axc+3xa=35    ; b-c+3=9
ax(b-c+3)=45
ax9=45
a=45:9
a=5