带分数除法.
(1)例:4
÷1
=
÷
= =
分数除法中有带分数的,先把带分数化成 ,然后 .
(2)试一试.
16÷1
÷1
4
÷5
÷1
2
÷1
6
÷
1
×3
2
﹣
.
直接写得数.
345+233= 45×11= 527﹣398= 235﹣47﹣53=
0.78+1.32=
= 2.56+1.4= 1.9×4×0.5=
3.67÷100= 3.25×1000= 0.125×0.8= 3.6+2.8+6.4=
6.08×304≈ 4838÷61≈ 15﹣2.55=
=
=
=
=
=
直接写出得数:
578+216= 18.25﹣3.3= 0.99×9+0.99= 3.2﹣
= 2
÷3=
2
×
=
×8.1= 1
×8+1
×2=
+
= 21
÷7=
直接写得数:
728﹣299=0.125×0.125= 6÷
=
×
×0= 24×(
﹣
)=
÷5=
+
= 0.1×20%=(0.8﹣0.5)÷0.5= 3×6÷3×6=
直接写出得数
67+303= 50﹣10.91= 0.8×10=
=
= 24×50%= 6÷
=
=
5.6÷0.7=
= 98×99≈ 562÷80≈
口算:
223﹣99= ; 24÷0.04= ; 0.9+99×0.9= ; 25×4÷25×4= ;
7.5+0.25= ;
= ;
= ;
= .