把40+40+40+40+40写成乘法算式 .
涂一涂,算一算,填一填. (1) + = + = (2) ﹣ = ﹣ = .
我会填. (1) = = ; (2) =﹣ = .
在横线里填上合适的数. (1)+ = (2)+ =1 (3)﹣ = (4) ﹣=0.
看图写算式. (1) + + = . × = (2) + = = . × = = (3) + + + = . × = .
+=+= .(判断对错)