四年级简便运算(乘法分配律)450道(共12页).docx

精选优质文档-倾情为你奉上简便运算（乘法分配律）450道28 29 + 42 29 =34 38 + 46 38 =7 70 + 7 20 =71 68 + 71 22 =72 11 + 72 49 =27 24 + 27 46 =55 43 + 55 17 =76 3 + 76 77 =45 68 + 5 68 =61 23 + 61 37 =30 35 + 30 35 =4 84 + 66 84 =46 49 + 46 1 =52 96 + 8 96 =34 19 + 36 19 =46 39 + 44 39 =30 65 + 30 5 =83 36 + 83 4 =27 34 + 23 34 =27 75 + 27 15 =5 30 + 5 20 =34 84 + 6 84 =62 6 + 62