1平方米绿草地每天大约能释放出氧气15克，吸收二氧化碳20克．华庭小区共有780平方米草坪．（1）每天大约能释放氧气多少克？（2）每天大约能吸收二氧化碳多少克？
直接写出得数 3×= ×= ×18= ×= = ÷= ÷= 3×= ．
直接写得数．========
12+9.9= 1÷0.25=÷=×50%=﹣=（0.75﹣）×96=
直接写得数．+= 6÷=÷4= 2×=÷5= 24÷=×=÷=×24=×=÷=×=
﹣=÷12= 15×= 36÷=+=×12=÷=×=
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