一张长方形纸板周长是78厘米，长是24厘米，宽是多少厘米？面积是多少？
直接写出得数．×= ÷= ÷26= = == ×÷= = = 1.2÷=
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÷．
×
= 
÷
÷26= 
= 
=
= 
×
÷
= 
= 
= 1.2÷
=
×
= 
÷5= 1÷
= 15×
= 1.25×
=
×4= 
÷
= 1.8﹣40%= 12×（
+
）= 
×6+4×
= 
= 
= 
=
= 
= 
= 
=
= 
= 
= 
=
×0 
×
×12 
÷
1÷
÷2 
÷
×
×
．
②
×
③12÷
④
÷
．
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