如题所述
1ã450÷18
=450÷9÷2
=50÷2
=25
2ã420÷15
=420÷3÷5
=140÷5
=28
3ã480÷15
=480÷3÷5
=160÷5
=32
=450÷9÷2
=50÷2
=25
2ã420÷15
=420÷3÷5
=140÷5
=28
3ã480÷15
=480÷3÷5
=160÷5
=32
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