如图（单位：米），阴影部分的面积分别是S1和S2，S1与S2的比为1：4，求S1、S2．
直接写得数． 0.1÷0.01=+3.25= 11﹣= 9.5+0.15=﹣= （0.18+）÷9= 4.5÷+×0= 1.25×3.2×25=×÷×15=×÷×=
直接写出下列各题得数． 2.5×8=﹣=﹣= 2.54+4.6=+= 8.2﹣5.6=+=+=
直接写出得数： 0.25×4= 5.4+4.6=+=﹣=+=﹣+=
口算 0.24×40=﹣=+= 7÷50=+7= 15.42﹣6.3=
直接写出得数. 4.1×0.5= 7.6×2.5×4= 2.88÷0.4= 1.35÷5= 2.5﹣1.37=+=+=++=+=+=
+3.25= 11﹣
= 9.5+0.15=
﹣
=
）÷9= 4.5÷
+
×0= 1.25×3.2×25=
×
÷
×15=×
÷
×=+3.25= 11﹣= 9.5+0.15=﹣=）÷9= 4.5÷+×0= 1.25×3.2×25=×÷×15=×÷×=
﹣
=
﹣
= 2.54+4.6=
+
= 8.2﹣5.6=
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=
+
=
+
=
﹣
=
+
=
+
=
﹣
=
+
= 7÷50=
+7= 15.42﹣6.3=
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