3 分数除法
小明做了80道口算题,其中有4道做错了.
(1)做错的题目数占总数的几分之几?
(2)做对的题目数占总数的几分之几?
(3)做错题数占做对题数的几分之几?
小杰家去年上半年的用电的情况统计如下:
月份 1 2 3 4 5 6
用电量(千瓦时) 205 217 138 98 77 100
(1)用电最少月份的用电量占第二季度的用电总量的几分之几?
(2)第二季度的用电量占上半年用电总量的几分之几?
口算
84+98= ; 0.65+0.35= ; 903÷3= ;
+
= ;
3.99﹣1.25﹣0.99﹣0.75= ;
÷9= ; 498×41≈ ; 1÷0.125= .
直接写出得数:
696+203= ; 508﹣198= ; 0.6×1.5= ; 0.875×24= ;
2.2+1.08= ; 10÷0.1= ; 24÷
= ;
+
= ;
1÷
×
= ;
+
÷
= 1
.
直接写出得数.
500÷125= 3.14×6= 5.4+46%= 36×25=
÷8=
÷50%= 3.14×202= 7.82﹣4
= 2﹣
+3+
= (
+
)×16=





=
÷
=
×
=
﹢
=
×
=
×
=
﹣
=
÷4=
= ②
= ③
= ④
=
= ⑥
= ⑦
= ⑧
=
= ⑩1÷6÷3=
=
=
=
=
=
=
千米用汽油
升,那么1千米用汽油 升;用1升汽油可行 千米.
和
表示的意义相同. .
= 0.32=
﹣
×
÷
+
= 15÷1%=
+0.5﹣
= 1﹣0.32=
+
=
﹣
= 24÷
=
×45=
×2.4○
÷12○
÷
○
×
○
÷0.1○
○
○
○
○
.
÷
.
×2.1=
﹣
=
÷2.5=
÷2÷
= 8×25%=
=
=
=
= 0.8:1.5=
÷
=
×
=
= 25%×4=
+
= 0.52= 9π=
= 3.25×
= 31﹣3.1=
=
=
÷
=
×
÷
﹣
=
= 1+
﹣
= (
+
)×9=
= 1.5×100= 1.25×8= 99×0.8+0.8=
×12= 5.6﹣6.6﹣19=
÷
= 5+(﹣
)=
×
÷
=
×
+
=
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