Răspuns:
Explicație pas cu pas:
a×10+72=5272
a x 10 = 5272 - 72 = 5200
a = 5200 : 10 = 520
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(b+13)×100-4200=5800
(b + 13) x 100 = 5800 + 4200 = 10000
b + 13 = 10000 : 100 = 100
b = 100 - 13 = 87
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3290-c×100+460=750
c x 100 = 3290 + 460 - 750 = 3000
c = 3000 : 100 = 30
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d×1000:10-210×100=8900
d x 1000 : 10 - 21000 = 8900
d x 1000 : 10 = 8900 + 21000 = 29900
d x 1000 = 29900 x 10 = 299000
d = 299000 : 1000 = 299
