Вправи 101 - 201 » 116-117

3 ● 9 + 43 = 27 + 43 = 70 3 ● 7 + 37 = 21 + 37 = 58 7 ● 2 + 7 ● 1 = 14 + 7 = 21 24 : 4 – 4 : 1 = 6 – 4 = 2 37 – 20 ● 1 = 37 – 20 = 17 (37 – 20) : 1 = 17 : 1 = 17 117. 37 + 0 = 37 37 ● 0 = 0 0 : 40 = 0 0 ● 0 = 0 20 – 2 ● 0 = 20 (20 – 2) ● 0 = 0 43 + 17 ● 0 = 43 43 ● 0 + 17 = 17