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简介:
1200÷25
=(1200×4)÷(25×4)
=4800÷100
=48
240÷12
=(240÷6)÷(12÷6)
=40÷2
=20
120÷15
=(120×2)÷(15×2)
=240÷30
=8
5400÷600
=(5400÷100)÷(600÷100)
=54÷6
=9
280÷35
=(280×2)÷(35×2)
=560÷70
=8
210÷42
=(210÷7)÷(42÷7)
=30÷6
=5
4200÷60÷70
=4200÷ (60×70)
=4200÷4200
=1
150÷25
=(150×4)÷(25×4)
=600÷100
=6