我来做“小厨（chú ）师”﹣﹣“午餐（cān）搭配”．请你从下面的5种食品中选出2种来作为我们的“午餐”，其中一种是主食，另一种是副食．（①②为主食，③④⑤为副食．）可以有几种不同的搭配方法？请用线连接起来．
口算．×= ÷5= 1÷= 15×= 1.25×=×4= ÷= 1.8﹣40%= 12×（+）= ×6+4×=
直接写出复数． = = = == = = == = = =
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+= ÷=
×
= 
÷5= 1÷
= 15×
= 1.25×
=
×4= 
÷
= 1.8﹣40%= 12×（
+
）= 
×6+4×
= 
= 
= 
=
= 
= 
= 
=
= 
= 
= 
=
×0 
×
×12 
÷
1÷
÷2 
÷
×
×
．
②
×
③12÷
④
÷
．
×
= 2.4÷
= 7﹣
﹣
= 0.24×50%=
÷7= 
×37.5%= 1÷
÷1= 
÷
=
×
= 1
÷
= 
×9+
÷
=
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