а) (21 + 8)⋅2 + 27 = 29⋅2 + 27 = 58 + 27 = 85(21 + 8) \(\boldsymbol{\cdot}\) 2 + 27 = 29 \(\boldsymbol{\cdot}\) 2 + 27 = 58 + 27 = 85
б) (5 + 13)⋅4 - 22 = 18⋅4 - 22 = 72 - 22 = 50(5 + 13) \(\boldsymbol{\cdot}\) 4 - 22 = 18 \(\boldsymbol{\cdot}\) 4 - 22 = 72 - 22 = 50
в) 48⋅6 + 54⋅9 = 8 + 6 = 1448 \(\boldsymbol{\cdot}\) 6 + 54 \(\boldsymbol{\cdot}\) 9 = 8 + 6 = 14
г) 72⋅9 + 63⋅9 = 8 + 7 = 1572 \(\boldsymbol{\cdot}\) 9 + 63 \(\boldsymbol{\cdot}\) 9 = 8 + 7 = 15
д) 69 - 4⋅13 = 69 - 52 = 1769 - 4 \(\boldsymbol{\cdot}\) 13 = 69 - 52 = 17
е) 18⋅5 - 26 = 90 - 26 = 6418 \(\boldsymbol{\cdot}\) 5 - 26 = 90 - 26 = 64