内容正文:
商不变的规律之简便运算
1、 除法类
6300÷900
6400÷32
8100÷27
7200÷80
1600÷200
4800÷12
5400÷180
4000÷80
3200÷40
2、 乘法类
1200÷25
4000÷125
3500÷25
240÷15
800÷50
1750÷125
2800÷35
1150÷25
2700÷15
3、 一个数连续除以两个数(字母表达式:a÷b÷c=a÷(b×c))
7600÷25÷4
6300÷20÷5
23000÷125÷8
4500÷15÷2
6000÷8÷125
5400÷4÷25
9600÷12÷8
4800÷12÷4
270÷5÷6
4、 一个数除以两个数的乘积
3200÷(8×8)
480÷32
3600÷72
1500÷(6×5)
7200÷(90×4)
810÷(3×9)
360÷(9×5)
2100÷(7×5)
6300÷(9×7)
商不变的规律之简便运算(答案)
5、 除法类
6300÷900
=(6300÷100)÷(900÷100)
=63÷9
=6
6400÷32
=(6400÷8)÷(32÷8)
=800÷4
=200
8100÷27
=(8100÷9)÷(27÷9)
=900÷3
=300
7200÷80
=(7200÷10)÷(80÷10)
=720÷8
=90
1600÷200
=(1600÷100)÷(200÷100)
=16÷2
=8
4800÷12
=(4800÷6)÷(12÷6)
=800÷2
=400
5400÷180
=(5400÷6)÷(180÷6)
=900÷30
=30
4000÷80
=(4000÷10)÷(80÷10)
=400÷8
=50
3200÷40
=(3200÷10)÷(40÷10)
=320÷4
=80
6、 乘法类
1200÷25
=(1200×4)÷(25×4)=4800÷100
=48
4000÷125
=(4000×8)÷(125×8)
=32000÷1000
=32
3500÷25
=(3500×4)÷(25×4)
=14000÷100
=1400
240÷15
=(240×2)÷(15×2)
=480÷30
=16
800÷50
=(800×2)÷(50×2)
=1600÷100
=16
1750÷125
=(1750×8)÷(125×8)
=14000÷1000
=14
2800÷35
=(2800×2)÷(35×2)
=5600÷70
=80
1150÷25
=(1150×4)÷(25×4)
=4600÷100
=46
2700÷15
=(2700×2)÷(15×2)
=5400÷30
=180
7、 一个数连续除以两个数(字母表达式:a÷b÷c=a÷(b×c))
7600÷25÷4
=7600÷(25×4)
=7600÷100
=76
6300÷20÷5
=6300÷(20×5)
=6300÷100
=63
23000÷125÷8
=23000÷(125×8)
=23000÷1000
=23
4500÷15÷2
=4500÷(15×2)
=4500÷30
=150
6000÷8÷125
=6000÷(8×125)
=6000÷1000
=6
5400÷4÷25
=5400÷(4×25)
=5400÷100
=54
9600÷12÷8
4800÷12÷4
270÷5÷6
8、 一个数除以两个数的乘积
3200÷(8×8)
=3200÷8÷8
=400÷8
=50
480÷32
=480÷(4×8)
=480÷8÷4
=60÷4
=15
3600÷72
=3600÷(8×9)
=3600÷9÷8
=400÷8
=50
1500÷(6×5)
=1500÷5÷6
=300÷6
=50
7200÷(90×4)
=7200÷90÷4
=80÷4
=20
810÷(3×9)
=810÷9÷3
=90÷3
=30
360÷(9×5)
=360÷9÷5
=40÷5
=8
2100÷(7×5)
=2100÷7÷5
=300÷5
=60
6300÷(9×7)
=6300÷9÷7
=700÷7
=100
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