《2025年灵机一动小学数学口算心算一年级上册苏教版》

口算练习 11
1 2 3 4
$0+8= $8 $1+7= $8 $2+6= $8 $3+5= $8
$8+0= $8 $7+1= $8 $6+2= $8 $5+3= $8
$8-0= $8 $8-1= $7 $8-2= $6 $8-5= $3
$8-8= $0 $8-7= $1 $8-6= $2 $8-3= $5
5 6 7 8
$1+8= $9 $2+7= $9 $3+6= $9 $4+5= $9
$8+1= $9 $7+2= $9 $6+3= $9 $5+4= $9
$9-1= $8 $9-2= $7 $9-3= $6 $9-4= $5
$9-8= $1 $9-7= $2 $9-6= $3 $9-5= $4

答案： 1. $0 + 8 = 8$
$8+0 = 8$
$8 - 0 = 8$
$8 - 8 = 0$
2. $1 + 7 = 8$
$7+1 = 8$
$8 - 1 = 7$
$8 - 7 = 1$
3. $2 + 6 = 8$
$6+2 = 8$
$8 - 2 = 6$
$8 - 6 = 2$
4. $3 + 5 = 8$
$5+3 = 8$
$8 - 5 = 3$
$8 - 3 = 5$
5. $1 + 8 = 9$
$8+1 = 9$
$9 - 1 = 8$
$9 - 8 = 1$
6. $2 + 7 = 9$
$7+2 = 9$
$9 - 2 = 7$
$9 - 7 = 2$
7. $3 + 6 = 9$
$6+3 = 9$
$9 - 3 = 6$
$9 - 6 = 3$
8. $4 + 5 = 9$
$5+4 = 9$
$9 - 4 = 5$
$9 - 5 = 4$