Вправи 402 - 501 » 445

45 – 3 ● 9 = 45 – 27 = 45 – 25 – 2 = 20 – 2 = 18 81 : 9 + 9 = 9 + 9 = 18 4 ● 10 + 5 ● 8 = 40 + 40 = 80 10 ● 2 + 10 : 2 = 20 + 5 = 25 2 ● 7 ● 5 = 2 ● 5 ● 7 = 10 ● 7 = 70 4 ● 0 ● 5 = 0 72 : 9 : 4 = 8 : 4 = 2 56 : 7 ● 8 = 8 ● 8 = 64

Вправи 402 - 501