1. a) 320-(64:8+16); в) 98-72:9- (35 +55) : 3; д) 26- (53-48)*4-4; ж) 66-(65-47): 6+3;

a) 320-(64:8+16) = 320 - (8 + 16) = 320 - 24 = 296

в) 98-72:9- (35 +55) : 3 = 98 - 8 - 90 : 3 = 98 - 8 - 30 = 90 - 30 = 60

д) 26- (53-48)*4-4 = 26 - 5 * 4 - 4 = 26 - 20 - 4 = 6 - 4 = 2

ж) 66-(65-47): 6+3 = 66 - 18 : 6 + 3 = 66 - 3 + 3 = 63 + 3 = 66