用简便方法计算25X(40十4)。(|25十25)X8。63X48+63x52。(200+2)x68。56x99十36。72x103一72x3
(125+25)x8
=125x8+25x8
=1000+200
=1200
63x48+63x52
=63x(48+52)
=63x100
=6300
(200+2)x68
=200x68+2x68
=13600+136
=13736
56x99+56
=56x(99+1)
=56x100
=5600
72x103-72x3
=72x(103-3)
=72x100
=7200
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