口算600÷20= 300×32= 57÷3= 52= 400×6=11×800= 28×3= 50×100= 36×3= 15×6=360÷30= 60×50=
口算.+=﹣=+﹣= 3+=+= 1﹣﹣=++= 4﹣=
计算：．
= ．
直接写得数． 1﹣+= 1÷×= 0.5﹣+0.5﹣= 8.1+=（+）×24= 7÷×7÷= 9﹣0.9= 72÷0.4= 1.25×8= 0×24+5=
+
﹣
=
+
﹣
= 3+
=
+
= 1﹣
﹣
=
+
+
= 4﹣
=
．
= ．
= ．
+
= 1÷
×
= 0.5﹣
+0.5﹣
=（
+
）×24=
×7÷
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