脱式计算．（能简算的要简算）12.56﹣6.64﹣3.36 45.5﹣（0.98+5.5）13.6+7.94+6.4 15.19+3.36+4.64+4.81．
直接写出得数．==12== 1.6== 0.8==
40比35多几分之几？
多少千克的是50千克？
口算÷=÷=÷12=÷= 45÷= 9÷=÷=÷= 18÷=÷=
计算下面各题÷÷．
=
=12
=
= 1.6
=
=
=
=
是50千克？
÷
=
÷
=
÷
= 45÷
=
=
÷
=
÷
= 18÷
=
÷
=
÷
÷
．
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