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1、两位是减一位数退位减法练习题26-9= 32-7= 24-6= 25-7= 35-6=42-8= 26-8= 32-8= 32-9= 35-7=33-5= 33-9= 34-5= 34-6= 34-9=35-9= 36-7= 36-9= 37-9= 38-9=20-4= 40-4= 21-8= 20-8= 30-7=40-2= 31-4= 31-7= 40-1= 22-6=40-3= 40-5= 40-9= 41-2= 33-8=41-3= 41-5= 41-7= 23-8= 41-9=42-3= 22-9= 23-5= 25-8= 27-9=42-4= 42-5= 42-7= 42-9= 4
2、3-4=43-5= 43-7= 61-8= 53-5= 62-5=53-8= 43-9= 44-5= 44-7= 45-6=45-8= 53-7= 61-4= 46-7= 46-9=47-8= 48-9= 54-8= 60-6= 63-6=63-5= 50-1= 50-3= 50-5= 50-7=55-8= 62-8= 50-9= 51-2= 51-5=64-8= 51-7= 51-9= 52-3= 52-7=43-6= 44-8= 52-8= 52-9= 53-4=53-6= 45-9= 53-9= 54-5= 46-8=61-7= 60-8= 54-6= 54-7= 50-2=61-3=
3、54-9= 55-6= 50-6= 61-6=17 - 8 = 27 - 8 = 37 - 8 = 64 - 6 = 54 - 6 = 44 - 6 = 34 - 6 = 24 - 6 = 14 - 6 = 25 - 6 = 14 - 9 = 33 - 7 = 46 - 9 = 22 - 4 = 23 - 8 = 12 - 6 = 52 - 9 = 42 - 8 = 32 - 4 = 75 - 7 = 62 - 5 = 46 - 8 = 28 - 9 = 16 - 8 = 21 - 4 = 18 - 9 = 35 - 6 = 31 - 4 = 16 - 7 = 33 - 5 = 32 - 5
4、= 42 - 5 = 57 - 9 = 61 - 4 = 73 - 5 = 74 - 6 = 54 - 7 = 23 - 4 = 36 - 8 = 14 - 5 = 16 - 8 = 23 - 6 = 26 - 8 = 14 - 7 = 82 - 6 = 84 - 7 = 91 - 4 = 67 - 9 = 55 - 6 = 47 - 8 = 11 - 4 = 21 - 4 = 31 - 4 = 41 - 4 = 51 - 4 = 14 - 7 = 24 - 7 = 34 - 7 = 483= 843=20-5= 50-7= 40-3= 60-2=30-6= 20-8= 50-4= 70-4=
5、20-5= 70-8= 40-7= 80-4=90-1= 60-7= 80-5= 70-3=20-3= 70-5= 40-6= 80-8=60-4= 30-5= 50-6= 60-2=30-4= 40-5= 50-7= 60-3=37-8= 22-4= 23-9= 42-6=41-7= 63-8= 53-6= 54-9=81-2= 26-8= 85-8= 38-9=73-7= 38-9= 45-9= 72-3=24-6= 63-8= 72-5= 34-8=71-7= 65-8= 48-9= 24-7=53-9= 68-3= 46-9= 21-7=把正确的得数圈出来。458（37,47）929（
6、2 ,83）847（14,77）376（21,31）提问：在计算两位数减一位数的减法时，你有什么要提醒大家的？565618 6310549 5777242填一填。在里填“”、“”或“=”。6146546526 722703135923+8238849845（1）直接写得数。7468075472784952569896220（2）在得数比50小的算式后面画“”。54942874405944263630（3）解决问题。亮亮带30元去买一个书包28元，应找回多少元？六智力冲浪，拓展练习。和各表示什么数字?85()()348=438=834= 384=1862772823662782399457786
7、04805485496188487187 506607908509912756935436849668427328738839345246157558675486939445846467859873764779689691256157658759567582683394475 75727428803915947447328129284865848356957758346437538968669578879489 695737357892416617229918834765574195376457618246547848349氨氧化催化剂往往亦可用作醛类氧化催化剂,其原因是由于这两类反应通过类似的历程,形成相同的氧化中间物之故。上列反应中以丙烯氨氧化合成丙烯腈最为重要,下面即以此反应为例进行讨论。5
