Răspuns:
Explicație pas cu pas:
a)
( - 13 + 13 ) × 13 + 13 = 13 ( 1)
= 0 × 13 + 13 =
= 0 + 13 =
= 13
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b)
- 13 + 13 × (13 + 13) = 325 (2)
= - 13 + 13×26 = sau = - 13 + 13×26 =
= -13×(1-26) = = - 13 + 338 =
= - 13 × ( - 25) = = 325
= 325
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( - 13 + 13) × ( 13+13) = 0 × 26 = 0 (3)
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- 13 + (13×13+13) = 169 (4)
= - 13 + (169+13) =
= - 13 + 182 =
= 169
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( - 13 + 13×13) + 13 = 169 (5)
= ( - 13 + 169 ) + 13 =
= 156 + 13 =
= 169
R: 5 moduri