在两幢楼中间每隔3米种1棵树，共种了20棵，这两幢楼之间距离是多少？
直接写出得数．0.57+0.43= 4.13﹣1.3= 2.5×28=7.2÷0.6= 0.52= 3﹣1=（+）= 15÷×= ×8+8×=
快快算.6.0﹣2.4= 5.3+3.5= 4.7+3.6=20×13= 24×30= 640÷9== = =
口算下列各题．9.9+0.01= 0.08×0.5= 1.25×0.5×0.8== = ﹣+=
直接写出得数①5÷2= ②0.2×3= ③7.5+25=④5.5﹣0.5= ⑤+= ⑥1﹣=
直接写出得数．6.4+0.16= 3.8﹣2= ×5+×9=343+257= 80÷0.02= 87.58﹣（7.58﹣3.8）=
=
+
）= 15÷
×
×8+8×
=
= 
= 
=
= 
= 
﹣
+
+
= ⑥1﹣
=
= 
×5+
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