南湖街道开展植树造林活动，5人3天共植树90棵，照这样计算，30人3天共植树多少棵？
直接写出下面各题的结果．
56+37= 80﹣16= 31.5+5= 12﹣1.1=
1.2×0.2= 2.87÷0.7=
=
=
30÷50= 25×8=
=
=
12×
1÷
= 0×
=
×2÷×2=
直接写出得数．
684+198= 14.3﹣0.8= 2.5×40= 0.35×99+0.35=
÷6=
1﹣
+
= 3.7×1000= 7×8×（
+
）=
×
=
÷2=
÷
×0=
×4+= 7﹣
=
÷
= 4×
×
=×4÷×4=
直接写得数．
180+470= 5÷8= 25×2.4= 12﹣
=
÷14=
+
= 1.25×
×0.8=
×=
÷
=
﹣
=
×4÷4×= 2.4×
=
（
+
）×16= 12.01×9.98≈ 2÷0.2%= 60×20%=
直接写出下面各题的结果．
127+38= 1.02﹣0.43= 8.8÷0.2= 2﹣1
=
×1
= 1÷7+= 1﹣1×
=
+
=
÷
= 14÷
= 0.23×4= 5×3.14=
700×0.01%=
×
=
÷25%×
=
×2÷
×2=
直接写出得数．
×3= 4÷
= 125%×8= 32=
﹣
= 2.5×4= 5.7﹣0.57= 0×12.5=
15×（1.4﹣1.4）= 5﹣
﹣
=