《2025年口算训练二年级数学上册北师大版双色升级版》

第73片
$3×9= $27
$8×2= $16
$2×3= $6
$8×4= $32
$5×7= $35
$4×7= $28
$5×3= $15
$9×5= $45
$3×6= $18
$3×2= $6
$2×7= $14
$5×2= $10
$4×5= $20
$8×5= $40
$8×3= $24
$2×4= $8
$5×1= $5
$9×3= $27
$6×3= $18
$3×4= $12
$4×9= $36
$5×7= $35
$4×8= $32
$3×5= $15
$7×4= $28
$5×9= $45
$2×9= $18
$3×7= $21
$4×1= $4
$5×4= $20
$5×5= $25
$6×4= $24
$7×5= $35
$6×5= $30
$7×3= $21
$4×2= $8
$9×2= $18
$2×5= $10
$7×2= $14
$3×8= $24
$4×3= $12
$2×8= $16
$9×4= $36
$4×6= $24
$5×6= $30

答案： 27
16
6
32
35
28
15
45
18
6
14
10
20
40
24
8
5
27
18
12
36
35
32
15
28
45
18
21
4
20
25
24
35
30
21
8
18
10
14
24
12
16
36
24
30

(1)$12,15,18,$21,24。乘法口诀：三七二十一，三八二十四
(2)$18,16,14,$12,10。乘法口诀：二六十二，二五一十
(3)$25,30,35,$40,45。乘法口诀：五八四十，五九四十五
(4)$35,28,21,$14,7。乘法口诀：二七十四，一七得七

答案：
(1)21,24 乘法口诀：三七二十一，三八二十四
(2)12,10 乘法口诀：二六十二，二五一十
(3)40,45 乘法口诀：五八四十，五九四十五
(4)14,7 乘法口诀：二七十四，一七得七