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Afla numarul necunoscut
x+21 ori 100=45237
420 ori 10+y-143=4105
z-57 ori 1000+2324=530 ori 100
Dau coroana


Răspuns :

x+21 ×100=45237
x=45237-2100
x=43137

420 ×10+y-143=4105
4200+y-143=4105
y=4105-4200+143
y=48

z-57 ×1000+2324=530 ×100
z-57000+2324=53000
z-54676=53000
z-53000+54676
z=107676

x+21*100=45237⇔x+2100=45237⇔x=45237-2100⇔x=43137
420*10+y-143=4105⇔ 4200+y-143=4105⇔ 4200+y=4105+143⇔ 4200+y=4248⇔y=4248-4200⇔y=48
z-57*1000+2324=530*100⇔z-57000+2324=53000⇔z-59324=53000⇔ z=53000+59324⇔z=112324