1.

$□ ◯ □ ◯ □ =□$
$□ ◯ □ ◯ □ =□$
答案:
1. 4×4+3=19
2. 说说先算什么,再计算。
$5×2 + 3 =$ $3×3 - 4 =$
$2×3 - 4 =$ $3×5 + 4 =$
$5×2 + 3 =$ $3×3 - 4 =$
$2×3 - 4 =$ $3×5 + 4 =$
答案:
2. 13 5 2 19
3. 算一算,比一比。
$4×3 + 4 =$ $5×2 + 5 =$
$4×4 =$ $5×3 =$
$4×3 + 4 =$ $5×2 + 5 =$
$4×4 =$ $5×3 =$
答案:
3. 16,16 15,15
4. 连一连。
$3×2$ 一二得二 $2×1$
$1×2$ 二三得六 $3×4$
$4×3$ 三四十二 $2×3$
$3×2$ 一二得二 $2×1$
$1×2$ 二三得六 $3×4$
$4×3$ 三四十二 $2×3$
答案:
$3×2$-二三得六,$2×1$-一二得二;$1×2$-一二得二,$3×4$-三四十二;$4×3$-三四十二,$2×3$-二三得六
5. 想一想,填一填。
$0 + 0 + 0 = □$ $0 + 0 + 0 + 0 + 0 = □$
$0×3 = □$ $0×5 = □$ $5×0 = □$
$0 + 0 + 0 = □$ $0 + 0 + 0 + 0 + 0 = □$
$0×3 = □$ $0×5 = □$ $5×0 = □$
答案:
5. 0 0 0 0 0 0 0 0
6. $3×4 =$ $5×5 =$ $5×3 =$
$3×6 =$ $4×2 =$ $6×6 =$
$4×5 =$ $5×1 =$ $2×6 =$
$3×6 =$ $4×2 =$ $6×6 =$
$4×5 =$ $5×1 =$ $2×6 =$
答案:
6. 12 25 15 18 8 36 20 5 12
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