Răspuns:
Explicație pas cu pas:
a = 45 : 9 × 8 - 20 + 2 × 9
a = 5 × 8 - 20 + 18
a = 40 - 20 + 18
a = 20 + 18
a = 38
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b = ( 6 × 8 - 48 ) × 9 + 63 : 9
b = ( 48 - 48) × 9 + 7
b = 0 × 9 + 7
b = 0 + 7
b = 7
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c = 32 - 6 × 4 + 17
c = 32 - 24 + 17
c = 8 + 17
c = 25
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a + b + c = 38 + 7 + 25 = 45 + 25 = 70
