63. (Устно.)
* 600 : 3 + 7 * 5 = 200 + 35 = 235
* 600 : (3 + 7) * 5 = 600 : 10 * 5 = 60 * 5 = 300
64.
* 8070 - 600 = 7470
* 5010 - 15900 : 100 + 786 = 5010 - 159 + 786 = 5637
* 40 * (16 - 8) * 2 = 40 * 8 * 2 = 640
* 40 - (16 - 8 * 2) = 40 - (16 - 16) = 40 - 0 = 40
* 30200 - 7020 : 10 * 3 + 68 = 30200 - 702 * 3 + 68 = 30200 - 2106 + 68 = 28196 + 68 = 28162
* 9800 * 30 = 294000