Răspuns:
Explicație pas cu pas:
ex 5
a+72353=207478
a=207478-72353=135125
(976303-572193)-b=235600
404110-b=235600
b=404110-235600=169510
(523211-172922)-c=253119
350289-c=253119
c=350289-253119=97170
472302-131976=171005+d
340326=171005+d
d=340326-171005=169321
ex 6
x+586000=a
a-376214=377216
a=377216+376214=753430
x=753430-586000=167430
ex7
168200+343517+x=514611
511717+x=514611
x=514611-511717=2894
ex8
x+840=14010
x1=14010-840=13170
x2=14011-840=13171
x3=14012-840=13172
x4=14013-840=13173
x5=14014-840=13174
x6=14015-840=13175
ex9
x-(217+578)=107
x-795=107
x=795+107=902