在横线里填上适当的数．300cm2= dm2；7m2= dm2；1400dm2= m2；2dm2= cm2；45m2= dm2；2600cm2= dm2．
直接写出得数．﹣= 12×=÷26=+=×=+= 1÷=×=
口算﹣=+=×=÷7=
直接写出得数． （1）1﹣0.25=（2）+= （3）2﹣=（4）0.5×= （5）20%÷=（6）×30%= （7）×=（8）0÷=
直接写出得数：÷=÷3=××=×9×=÷2= 5÷﹣÷5= 2.7﹣= 6×= （1.6+3.2）×0.125= 1÷=÷10= 6×= 1﹣75%=÷=×= 5÷1%= 4÷=
口算．+= 0.5×0.6÷0.5×0.6=82= 0.9+0.01= 4.5﹣2.8﹣0.7=÷0.75= 1+6÷7= 2÷=
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﹣
= 12×
=
÷26=
+
=
×
=
+
= 1÷
=
×
=
﹣
=
+
=
×
=
÷7=
+
=
=（4）0.5×
=
×30%=
×
=（8）0÷
=
÷
=
÷3=
×
×
=
×9×
÷2= 5÷
﹣
= 6×
=
=
÷10= 6×
=
÷
=
×
= 5÷1%=
=
+
= 0.5×0.6÷0.5×0.6=82= 0.9+0.01=
÷0.75= 1+6÷7= 2÷
=