用简便方法计算．0.25×0.5×16 0.78×2020.8×630×0.125 9.7×0.47+1.53×9.7﹣9.7．
直接写得数÷= 18×=+=××= 1÷50%=×0=﹣= 6×﹣×5=
你能全算对吗？试试看÷=×3=﹣= 6÷=（+）×56=+=×= 1÷5×=
一堆沙石，用去35吨，还剩15吨，剩下的沙石占这堆沙石的几分之几？
口算下面各题．= 18÷===．
直接写出得数．= 3﹣== 0.12÷20%= 0×= 0.56×0.1=÷26== 15﹣﹣=×4÷×4=
÷
= 18×
=
+
=
×
×
=
×0=
﹣
= 6×
﹣
÷
=
×3=
﹣
= 6÷
=（
+
）×56=
+
=
×
= 1÷5×
=
= 18÷
=
=
=
．
= 3﹣
=
= 0.12÷20%= 0×
=
÷26=
= 15﹣
﹣
=
×4÷
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