1. 口算。
$2 + 4 + 3 =$ $8 - 3 - 4 =$ $4 + 3 + 1 =$ $9 - 2 - 5 =$
$6 - 4 - 2 =$ $3 + 3 + 3 =$ $4 + 1 + 3 =$ $9 - 4 - 3 =$
$7 - 2 - 1 =$ $3 + 5 + 1 =$ $6 - 3 - 2 =$ $5 + 2 + 2 =$
$2 + 4 + 3 =$ $8 - 3 - 4 =$ $4 + 3 + 1 =$ $9 - 2 - 5 =$
$6 - 4 - 2 =$ $3 + 3 + 3 =$ $4 + 1 + 3 =$ $9 - 4 - 3 =$
$7 - 2 - 1 =$ $3 + 5 + 1 =$ $6 - 3 - 2 =$ $5 + 2 + 2 =$
答案:
1. 9 1 8 2 0 9 8 2
4 9 1 9
4 9 1 9
2. 看图列式计算。

$□ ◯ □ ◯ □ = □$

$□ ◯ □ ◯ □ = □$
$□ ◯ □ ◯ □ = □$
$□ ◯ □ ◯ □ = □$
答案:
2. 4+2+3=9 7-1-2=4
3.
$□ ◯ □ ◯ □ = □$
$□ ◯ □ ◯ □ = □$

$□ ◯ □ ◯ □ = □$
$□ ◯ □ ◯ □ = □$
答案:
3. 3+6-3=6 9-3+1=7
4.

$□ ◯ □ ◯ □ = □$
$□ ◯ □ ◯ □ = □$
答案:
4. 4+1+4=9
查看更多完整答案,请扫码查看