动物园有一只东北虎重215千克，一头野牛的体重是东北虎的3倍．这头野牛有多重？
口算21× ×0 × ×12 ÷12÷ 1÷ ÷2 ÷ ×÷×．
计算：①56× ②× ③12÷ ④÷．
直接写出得数．×= 2.4÷= 7﹣﹣= 0.24×50%=÷7= ×37.5%= 1÷÷1= ÷=×= 1÷= ×9+= ÷=
直接写得数．×= 1﹣= 7+6.2= ÷1=÷= ×= 2.5×= ×=
直接写出答案= = = == = = =
×0 
×
×12 
÷
1÷
÷2 
÷
×
×
．
②
×
③12÷
④
÷
．
×
= 2.4÷
= 7﹣
﹣
= 0.24×50%=
÷7= 
×37.5%= 1÷
÷1= 
÷
=
×
= 1
÷
= 
×9+
÷
=
×
= 1﹣
= 7+6.2= 
÷1=
÷
= 
×
= 2.5×
= 
×
=
= 
= 
= 
=
= 
= 
= 
=
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