\[\boxed{Стр.\ \mathbf{69}\text{.\ \ }\mathbf{ОК\ ГДЗ\ - \ домашка\ на\ 5}}\]
\[Что\ узнали.\ Чему\ научились\]
\[\boxed{\mathbf{34}.}\]
\[30 - 21 = 9\]
\[21 + 9 = 30\]
\[58 + 17 = 75\]
\[75 - 17 = 58\]
\[62 - 13 = 49\]
\[49 + 13 = 62\]
\[81 - 56 = 25\]
\[56 + 25 = 81\]
\[\boxed{\mathbf{35}.}\]
\[85 - 60 + 9 = 25 + 9 = 34\]
\[71 + 19 - 8 = 90 - 8 = 82\]
\[52 + (13 + 7) = 52 + 20 = 72\]
\[52 - (13 + 7) = 52 - 20 = 32\]
\[14 + 86 = 100\]
\[100 - 12 = 88\]
\[\boxed{\mathbf{36}.}\]
\[1)\ 5,\ 7,\ 9,\ 11,\ 13,\ 15.\]
\[2)\ 4,\ 6,\ 8,\ 10,\ 12,\ 14.\]
\[3)\ 24,\ 30,\ 36,\ 42,\ 48,\ 54.\]
\[4)\ 70,\ 66,\ 62,\ 58,\ 54,\ 50.\]
\[\boxed{\mathbf{37}.}\]
\[1)\ (29 + 11) - 15 = 40 - 15 =\]
\[= 25\]
\[2)\ (30 - 12) + 19 = 18 + 19 =\]
\[= 37\]
\[\boxed{\mathbf{38}.}\]
\[43 + 57 = 57 + 43\]
\[64 - 16 > 64 - 19\]
\[40 - 38 < 40 - 25\]
\[40 + 38 > 40 + 25\]
\[\boxed{\mathbf{39}.}\]
\[d = 8:\]
\[d + 7 = 8 + 7 = 15;\]
\[39 - d = 39 - 8 = 31.\]
\[d = 9:\]
\[d + 7 = 9 + 7 = 16;\]
\[39 - d = 39 - 9 = 30.\]
\[d = 12:\]
\[d + 7 = 12 + 7 = 19;\]
\[39 - d = 39 - 12 = 27.\]
\[d = 16:\]
\[d + 7 = 16 + 7 = 23;\]
\[39 - d = 39 - 16 = 23.\]
\[\boxed{\mathbf{40}.}\]
\[x - 6 = 9\]
\[x = 9 + 6\]
\[x = 15.\]
\[x + 2 = 42\]
\[x = 42 - 2\]
\[x = 40.\]
\[23 - x = 3\]
\[x = 23 - 3\]
\[x = 20.\]
\[\boxed{\mathbf{41}.}\]
\[12 - 8 = 4\ (белых\ гриба) -\]
\[было\ в\ лесу.\]
\[Ответ:4\ белых\ гриба.\]
\[\boxed{\mathbf{42}.}\]
\[13 - 7 = 6\ (маслят) - нашла\ \]
\[Юля.\]
\[Ответ:6\ маслят.\]
\[\boxed{\mathbf{43}.}\]
\[1)\ 34 - 16 = 18\ (уток) - было\ \]
\[в\ пруду.\]
\[2)\ 18 - 16 = 2\ (утки) -\]
\[больше,\ чем\ гусей.\]
\[Ответ:на\ 2\ утки\ больше.\]
\[\boxed{\mathbf{44}.}\]
\[1)\ 15 - 6 = 9\ (мотков) -\]
\[желтых\ ниток.\]
\[2)\ 9 - 6 = 3\ (мотка) - желтых\ \]
\[ниток\ больше,\ чем\ синих.\]
\[Ответ:на\ 3\ мотка.\]
\[\boxed{\mathbf{Задание\ на\ полях}.\ Набери\ 18}\]
\[8 + 7 + 3 = 18\]
\[9 + 7 + 2 = 18\]
\[6 + 5 + 7 = 18\]
\[8 + 6 + 4 = 18\]