Question

Daca a x (b+c) =6000,a x c = 4000,iar b = 10,atunci 303 x a = ?
daca a-b = 3550,c = 1800,calculeaza 2 x a - 2 x b - 3 x c

Answer 1

a x (b+c)=a x b+a x c, stiim ca a x c=4000 si b= 10, atunci inlocuim valorile

ax10+4000=6000

10a=6000-4000

10a=2000

a=2000:10

a=200

ex 2

a-b=3550, c=1800, 2a-2b-3c=?

2a-2b-3c= 2(a-b)-3c=2x3550-3x1800=7100-5400=1700

Answer 2

4000+10a=6000
10a=6000-4000
a=2000:10=200
c=4000:200=20
verificare:200•(10+20)=200•30=6000
303•a=303•200=60600
urm ex:
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