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(75x99+75)x4,怎么巧算
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(75x99+75)x4,怎么巧算
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(75x99+75)x4
=[75x(99+1)]x4
=75x100x4
=3x25x100x4
=3x100x(25x4)
=3x100x100
=30000
=[75x(99+1)]x4
=75x100x4
=3x25x100x4
=3x100x(25x4)
=3x100x100
=30000
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