一串彩旗共55面，按1红2黄1绿的顺序排列．红色彩旗是黄色彩旗的几分之几？
计算﹣×÷÷+﹣÷90%﹣12.5% 48%× 25%÷．
直接写得数﹣= 8×=÷= 3.5=×=×6=
口算我最棒!÷3=﹣= 8÷=×8= 30×50%= 0.25×29×4= 6÷120%= 1﹣97%=
+= 8÷=×= 3÷= 4×==÷===
直接写出得数．﹣=×=÷6= 1﹣10%=÷=÷= 1÷20%=+=×= 20×90%=
﹣
×
÷
÷
+
﹣
÷90%
﹣12.5% 48%×
．
﹣
= 8×
=
÷
= 3.5
=
×
=
×6=
÷3=
﹣
= 8÷
×8= 30×50%=
+
= 8÷
=
×
=
= 4×
=
=
÷
=
=
=
﹣
=
×
=
÷6= 1﹣10%=
÷
=
÷
= 1÷20%=
+
=
×
= 20×90%=
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