1800÷25 350÷25 7000÷125.
科技书的本数比文艺书少,把 看作单位“1”,科技书的本数是文艺书的 .
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) + + + = . × = .