用竖式计算．（带▲的要验算）（1）5.5×2.02（2）3.14×0.68（得数保留两位小数）（3）7.85×6.3（得数保留两位小数）▲（4）5.4×0.68．
80的是多少？
直接写得数×= 16×= ×=×= 1×25= 331.5×=×1= 0×= ．
根据乘法算式写出两道除法算式．
×5×6×5 10× 8× 12×．
直接写得数=×=×=×=×=×=×=×=×=
是多少？
×
= 
16×
= 
×
=
×
= 
1
×25= 33
1.5×
=
×1= 
= ．
×5
×6
×5
8×
12×
．
=
×
=
×
=
×
×
=
×
=
×
=
×
=
×
=
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