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afla numerele necunoscute...310+198+x=983, 123+x-123=519. 802-x-215=396. x-140-240=200

Răspuns :

1).x=983-310-198
x=475
2).x=519+123-123
x=519
3).802-215-396=x
x=191
4). a=200+240+140
x=580
x=983-805
x=178
x=519
x=802-215-396
x=291
x=200+140+240
x=580