求下面各角的度数．已知∠1=30°，∠2=90°．∠3= ；∠4= ；∠5= ．
把小数化成最简分数，把分数化成小数． 0.6= 0.875= 0.35= 1.36=====
化为带分数.．
把下列分数化成最简分数======
化成最简分数或整数.．
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