如题所述
16800/120
=1680/12
=1680÷4÷3
=420÷3
=140
123*18-123*3+85*123
=123*(18-3+85)
=123*100
=12300
21500/125
=21500÷5÷25
=4300÷5÷5
=860÷5
=172
=1680/12
=1680÷4÷3
=420÷3
=140
123*18-123*3+85*123
=123*(18-3+85)
=123*100
=12300
21500/125
=21500÷5÷25
=4300÷5÷5
=860÷5
=172
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