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Află nr necunoscut: 24×15+a=420, 23×56-b=843,c-75×45=1000. Vă rooog!!!!!

Răspuns :

24x15+a=420
360+a=420
a=420-360
a=60

23×56-b=843
1288-b=843
b=1288-843
b=445

c-75×45=1000
c-3375=1000
c=3375+1000
c=4375
24*15+a=420
360+a=420
a=420-360
a=60

23*56-b=843
1288-b=843
a= 1288-843
a= 445

c-75*45=1000
c-3375=1000
c=3375+1000
c= 4375