同学们采集树种．上午采集了18千克，下午再采集多少千克，正好是上午的3倍？
直接写出得数．×= 40%+50%= 81÷= 9.9÷0.1= 3.52+6.48= 1%÷=×2÷×2=
直接写出得数： 7×=÷6=÷=÷=÷=×0.15=÷=4×60%=
直接写得数．×8=÷2=÷=×= 10×=﹣=+= 21×=÷9=÷=
直接写出得数． ①÷7= ②1÷= ③×8= ④×= ⑤+= ⑥×= ⑦÷50%= ⑧36÷=
直接写出得数． 1﹣9=×120= 20×=×=×0=÷3= 4÷=÷=×=+=+==﹣=
×
= 40%+50%= 81÷
= 9.9÷0.1=
=
×2÷
=
÷6=
÷
=
÷
÷
=
×0.15=
÷
=4×60%=
×8=
÷2=
÷
=
×
=
=
﹣
=
+
= 21×
=
÷9=
÷
=
÷7= ②1÷
= ③
×8= ④
×
=
+
= ⑥
×
÷50%= ⑧36÷
=
×120= 20×
=
×
=
×0=
÷3= 4÷
=
÷
×
+
=
+
=
=
﹣
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