3 分数除法
计算:
×
= ;
÷
= ;
×8= ;
+
= ;
18×2%= ; 1﹣
= ; 3.5÷18= ; 137﹣63﹣37= ;
205﹣199+95= ;
:3= 求比值; 8.8+1.2= ; 1÷25%= .
直接写出得数
6.47﹣0.87= 10.8﹣2.63﹣7.37=
= (
+
)×8=
÷
+
=
1÷
= 5﹣
= 13.7×25+6.3×25=
+
÷
+
= 75%+
+25%= .
(1)图中两条折线有2个交点,左边第一个交点说明:从 岁开始, 生的平均身高开始超过 生;第二个交点说明:从 岁开始, 生的平均身高开始超过 生.
(2)该地区18岁的男生的平均身高比18岁的女生高
.
(3)从图中你还看到了哪些男女生平均身高变化趋势情况的信息?.
直接写出得数.
+
=
﹣
=
×
=
÷
=
×
=
﹣0.8=
+
=
÷4=
3.5﹣2.9= 36.4÷100= 1.7×0.3= 4.8+2=
×21= 9.82﹣0.2= 0.8÷0.002= 2.5×1.7×4=
直接写得数
0.8×0.6= 2﹣
= 1÷
=
×
=
7.2÷8×4= 3.25×4= 3.3﹣0.7= 0.9+99×0.9=
9÷
=
+
=
+
﹣
+
= (0.18+0.9)÷9=
口算
56+37= 80﹣16= 31.5+5= 12﹣1.1=
2×0.2= 2.87÷0.7= 30÷50= 25×8=
= 12×
=
×
= 
=
1÷
= 0×
=
+
= 
=
直接写出得数:
4800÷240= ; 25×12= ; 16.5÷10%= ;
+
= ; 1﹣
+
= ; 1.02﹣0.43= ;
14÷
= ; 0.32= ;
×
= ;
×2÷
×2= .
2.25×4= 1.01﹣0.91= 1÷0.01=
÷
=
÷5.25=
+6.25= 0.74×100= 742+258= 7×
÷7×
= 10﹣3.2﹣5.8=
=
+
=
+
= 0.9+99×0.9=
,这个数增加了9倍. .
+
= 0.36÷0.6=
÷
= 7×(
+
)=
﹣
=
a×20=
+
+
=
÷
═
=
×
=
÷
=
=
=
×
=
×12= 0.25÷2.5%= 51.3÷0.01=
= 0.75÷0.25=
=
= ②3﹣1
= ③
=
+3.75= ⑥
﹣
= ⑦1﹣2÷7= ⑧36×(
+
÷
=
×0= (
+
)×20=
÷
+
)×56= 10×
÷
=
+
)÷
+
+…+
÷
+
÷
.
0.5+1
×3.5
+
)×30 3÷2.8(估算)≈ 0.312×2(得数保留1位小数)≈
÷1= 1÷1%= (
﹣
)×8=
×1000=
×1×
= 0.9﹣0.35=
×
×
=
)2= 4﹣4×
= 4×(
+
)=
÷2÷
÷8=
÷
= 1÷
= (
+
)×12=
×
×0= 2÷
×3=
×
×19=
×
=
÷
=
×8=
+
=
×14= 20÷
= 1﹣
÷
=
﹣
﹣
= 2.4÷40%=
﹣
﹣
÷6×
=
=
÷2= 4÷
=
﹣
=
÷
= 4﹣
﹣
= 0÷
+
×0+9=
÷
=
÷
= 40×
=
÷
=
×12=
×
=
×201﹣
÷3= ; 3×
÷
= ;
= ; 9×
= ; 4÷
= ;
﹣
×
= .
=
÷
= 99×66+66= 8×98×125=
×(
﹣
)=
×
÷
×
= 1×0÷1=
÷
= 2÷0.02=
÷
=
÷5.25=
+6.25= 0.74×100=
=
×5+
×8= 15×(
+
)=
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