а) (64+72):8= - : - + - : - = -
(36+81):9=4 - : - + - = -
(63+49):7= - : - + - = -
(45+35):5= - : - + - = -
б) (54+48):6= - : - + - : - = -
(42+70):7= - : - + - : - = -
(72+81):9= - : - + - : - = -
(56+32)//=56/8+32/8=11
(36+81):9=4 - : - + - = -
(63+49):7= - : - + - = -
(45+35):5= - : - + - = -
б) (54+48):6= - : - + - : - = -
(42+70):7= - : - + - : - = -
(72+81):9= - : - + - : - = -
(56+32)//=56/8+32/8=11
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А) 64:8 + 72:8 = 8 + 9 = 1736:9 + 81:9 = 4 + 9 = 13
63:7 + 49:7 = 9 + 7 = 16
45:5 + 35:5 = 9 + 7 = 16
б) 54:6 + 48:6 = 9 + 8 = 17
42:7 + 70:7 = 6 + 10 = 16
72:9 + 81:9 = 8 + 9 = 17