计算下面各题,怎样简便就怎样计算?

2024-12-02 22:12:49
推荐回答(1个)
回答1:

19×25-25×9
=(19-9)×25
=10×25
=250

43×101-43
=(101-1)×43
=100×43
=4300

4500÷25÷4
=4500÷(25×4)
=4500÷100
=45

72×125÷9
=72÷9×125
=8×125
=1000

720÷45
=720÷9÷5
=80÷5
=16

264-19+36-31
=(264+36)-(19+31)
=300-50
=250