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afla termenul necunoscut :438+x-148=572 ; x-170+372=602 ; 831+x+169=1000

Răspuns :

438+x-148=572
438+x=572+148
438+x=720
x=720-438
x=282

x-170+372=602
x-170=602-372
x-170=230
x=170+230
x=400

831+x+169=1000
831+x=1000-169
831+x=831
x=0

Sper ca te-am ajutat!
a) 438+x-148=572
438+x=572+148
x= 720-438
x=282

b) x-170+372=602
x-170=602-372
x= 230+170
x=400

c) 831+x+169=1000
831+x=1000-169
x=831-831
x=0