直接写得数．①3451÷17×（323﹣299）= ②22.9×7.34+2.29×26.6= ③﹣（﹣）= 15 ④48.48﹣+﹣36.45= ⑤〔1，9﹣1.9×（﹣1.9）〕÷= ．
直接写得数． 5÷×16××30×÷11（+）×48
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÷===．
﹣（
﹣
）= 15
+
﹣36.45= 
﹣1.9）〕÷
= ．﹣（﹣）= 15 +﹣36.45= ﹣1.9）〕÷= ．
×16
×
×30
×
÷11（
+
）×48
÷
= 18×
=
+
=
×
×
=
×0=
﹣
= 6×
﹣
÷
=
×3=
﹣
= 6÷
=（
+
）×56=
+
=
×
= 1÷5×
=
= 18÷
=
=
=
．
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