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determinati termenul necunostut din : 235+157-85=375+x-207 1243-755=71+x-375 483+4375-x=270+3427-197

Răspuns :

483+4375-x=270+3427-197
4858-x=3500
x=4858-3500
x=1358

235+157-85=375+x-207
392-85=375+x-207
307+207=375+x
514=375+x
x=514-375
x=139

1243-755=71+x-375
488=71+x-375
488+375=71+x
863=71+x
x=863-71
x=792