题目内容
20×=2800
[ ]
A.140 B.1400 C.14
选数填空.
10 20 30 40 50 60 70 80
( )×( )=800
( )×( )=1200
( )×( )=3500
( )×( )=4200
( )×( )=2800
( )×( )=2400
选数填空.
40,50,60,70,800,30,20,90,80,420,1,10
( )×( )=800 ( )×( )=2800
( )×( )=4200 ( )×( )=3600
( )×( )=1500 ( )×( )=1800
( )×( )=2100 ( )×( )=64000
在下面的○里填上“>”、“<”或“=”
(1)280×70○2800×7 (2)10×28○21×20
选数填空
10 20 30 40 50 60 70 80 90
( )×( )=900