《2025年晨光智学同步指导训练与检测一年级数学上册人教版》

1.
$5 + 3 = □$
$3 + □ = □$
$8 - 5 = □$
$8 - □ = □$

答案： $5 + 3 = \boxed{8}$；
$3 + \boxed{5} = \boxed{8}$；
$8 - 5 = \boxed{3}$；
$8 - \boxed{3} = \boxed{5}$。

2.
$7 + □ = □$
$2 + □ = □$
$9 - □ = □$
$9 - □ = □$

答案： 2,9;7,9;7,2;2,7

二、算一算。
$2 + 6 = $
$6 + 3 = $
$1 + 8 = $
$9 - □ = 1$
$4 + 5 = $
$7 + 2 = $
$9 - 2 = $
$□ - 4 = 4$
$9 - 1 = $
$1 + 7 = $
$9 - 5 = $
$9 - □ = 0$
$8 - 1 = $
$8 - 8 = $
$0 + 8 = $
$□ - 6 = 0$
$8 - 7 = $
$7 - 5 = $
$9 - 3 = $
$5 + □ = 8$
$6 - 5 = $
$6 + 1 = $
$8 - 5 = $
$9 - □ = 3$
$0 + 9 = $
$0 + 7 = $
$2 + 5 = $
$□ - □ = 2$

答案： $2 + 6 = 8$
$6 + 3 = 9$
$1 + 8 = 9$
$9 - 8 = 1$
$4 + 5 = 9$
$7 + 2 = 9$
$9 - 2 = 7$
$8 - 4 = 4$
$9 - 1 = 8$
$1 + 7 = 8$
$9 - 5 = 4$
$9 - 9 = 0$
$8 - 1 = 7$
$8 - 8 = 0$
$0 + 8 = 8$
$6 - 6 = 0$
$8 - 7 = 1$
$7 - 5 = 2$
$9 - 3 = 6$
$5 + 3 = 8$
$6 - 5 = 1$
$6 + 1 = 7$
$8 - 5 = 3$
$9 - 6 = 3$
$0 + 9 = 9$
$0 + 7 = 7$
$2 + 5 = 7$
$2 - 0 = 2$（答案不唯一，如3-1=2等也可）