《2025年心算口算巧算五年级上册北师大版》

1 列竖式计算，商是循环小数的用循环节表示。
7.2÷1.6=
8.1÷27=
25÷0.45=
75÷10.8=
5.6÷0.35=
18.4÷3.2=

答案： 7.2÷1.6=4.5
8.1÷27=0.3
25÷0.45=55.$\dot{5}$
75÷10.8=6.$\dot{9}$$\dot{4}$
5.6÷0.35=16
18.4÷3.2=5.75

2 脱式计算。
4.85+0.35÷1.4
0.68÷1.7×1.25
40.5÷0.81×0.18
(77.4-7.74)÷0.3
0.324÷(1.8+2.2)
(18.63-12.3)×1.5

答案： 4.85+0.35÷1.4
=4.85+0.25
=5.1
0.68÷1.7×1.25
=0.4×1.25
=0.5
40.5÷0.81×0.18
=50×0.18
=9
(77.4-7.74)÷0.3
=69.66÷0.3
=232.2
0.324÷(1.8+2.2)
=0.324÷4
=0.081
(18.63-12.3)×1.5
=6.33×1.5
=9.495