Вычислите.
а)
340 + 7 + 60
19 + 102 + 18
201 + 13 + 9
б)
70 − 15
36 − 27
105 − 8
в)
13 * 5
4 * 50
29 * 10
г)
500 : 100
800 : 40
240 : 30
340 + 7 + 60 = (340 + 60) + 7 = 400 + 7 = 407
19 + 102 + 18 = 19 + (102 + 18) = 19 + 120 = 139
201 + 13 + 9 = (201 + 9) + 13 = 210 + 13 = 223
70 − 15 = 70 − (10 + 5) = (70 − 10) − 5 = 60 − 5 = 55
36 − 27 = 36 − (21 + 6) = (36 − 6) − 21 = 30 − 21 = 9
105 − 8 = 105 − (5 + 3) = (105 − 5) − 3 = 100 − 3 = 97
13 * 5 = (10 + 3) * 5 = 10 * 5 + 3 * 5 = 50 + 15 = 65
4 * 50 = 4 * (5 * 10) = (4 * 5) * 10 = 20 * 10 = 200
29 * 10 = 290
500 : 100 = 5 : 1 = 5
800 : 40 = 80 : 4 = 20
240 : 30 = 24 : 3 = 8
