方法一:25x48=25x4x12
=100x12
=1200.
方法二:25x48=25x(40+4x2)
=25x40+25x4x2
=1000+100x2
=1000+200
=1200.
方法三:25x48=25x(50-2)
=25x50-25x2
=1250-50
=1200.
方法四:25x48=(100/4)x48
=(100x48)/4
=100x12
=1200.
方法一共有200多种
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