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？
== 12+2.28====+= 100﹣46= 0.12== 13÷65== 1.2÷0.6= 5÷10= 4×25= 1.6+8=+= 21÷9== 0.25+0.16= 1÷=
涂一涂，在下面的表中表示出算式的结果． （1）× （2）3÷
直接写出得数×=×= 9×=×= 0×= 18×=×=×=×=÷=
算一算，直接写出得数．×= 15÷=+=﹣=×=÷= 0÷=÷=××=÷×=．
直接写出得数．×=÷=﹣= 3.14×40= 75×10%= 3.14×5=÷3﹣= 7×÷7×= 125×1.6= 12.56÷6.28=
=
= 12+2.28=
=
=
=
+
= 100﹣46= 0.12=
=
= 1.2÷0.6= 5÷10= 4×25= 1.6+8=
+
= 21÷9=
= 0.25+0.16= 1÷
=== 12+2.28====+= 100﹣46= 0.12=== 1.2÷0.6= 5÷10= 4×25= 1.6+8=+= 21÷9== 0.25+0.16= 1÷=
×
×
=
×
= 9×
=
×
= 0×
=
=
×
=
×
=
×
=
÷
=
×
= 15÷
=
+
=
﹣
=
×
=
÷
= 0÷
=
÷
=
×
×
=
÷
×
=
÷
=
﹣
=
= 7×
÷7×
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