=124×（25+24）-25
=124×49-25
=124×（50-1）-25
=6200-124-25
=6200-149
=6200-150+1
=6050+1
=6051
123×25+124×24
=123×25+(124×24+124)-124
=123×25+124×25-124
=(123+124)×25-124
=247×25-124
=(248-1)×25-124
=248×25-1×25-124
=62×(4×25)-(25+124)
=62×100-149
=6200-(200-51)
=6200-200+51
=6000+51
=6051
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