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Afla numarul necunoscut a)24×15+a=420 b)23×56-b=843 c)c-75×45=1000

Răspuns :

24*25+a=420
600+a=420
600-420=
180=a

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


c-75*45=1000
c-3375=1000
c=3375-1000
c=2375
a).24*15+a=420
360+a=420
a=420-360
a=60

b).23*56-b=843
1288-b=843
b=1288-843
b=445

c).c-75*45=1.000
c-3375=1.000
c=1.000+3375
c=4375