每20㎡的树林每年可以吸收空气中的有害气体80g，某小区造了一条3300㎡的林带，一年可以吸收多少千克有害气体？
直接写得数．+= 0÷=×6= 7.125﹣= 8.4+8= 3：0.5= 6÷= 100×0.1%=﹣=×=÷=1÷5×=×÷3=×4+= 2﹣﹣=×5÷×5=
口算高速路． 476﹣98= 1×= 3×÷3×=== 0.25×0.4= 0.99××0==
直接口算写出下面各题的得数． 498+187= 6﹣4.5= 2.25×4= 10÷0.1=×= 1÷=×0.12×5=（﹣）×12=
的一半是多少？
直接写得数．=======
+
= 0÷
=
×6= 7.125﹣
=
= 100×0.1%=
﹣
=
×
=
÷
=1÷5×=
×
÷3=
×4+= 2﹣
﹣
=
×5÷×5=+= 0÷=×6= 7.125﹣== 100×0.1%=﹣=×=÷=1÷5×=×÷3=×4+= 2﹣﹣=×5÷×5=
= 3×
÷3×
=
=
= 0.25×0.4= 0.99×
×0=
=
×
= 1÷
=
×0.12×5=（
﹣
）×12=
的一半是多少？
=
=
=
=
=
=
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