计算下面各角的度数．∠1=38°∠2= ∠3= ∠4= ．
×=÷ =﹣ = ．
甲班人数是乙班人数的，甲班比乙班少，乙班比甲班多．
直接写出得数+=﹣= 25×8=×===
计算：2﹣1= ，2.25÷= ，+= ，×0.5= ．
速算题= = = = = = ．
=
÷ =
﹣ =
．
，甲班比乙班少
，乙班比甲班多
+
=
﹣
= 25×8=
×
=
=
=
= ，2.25÷
= ，
+
= ，
×0.5= ．
= 
= 
= 
= 
= 
= ．
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