4.25*5.24*1.52*2.巧算
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4.25*5.24*1.52*2.51
=4.25*4*1.31*1.52*2.51
=17*(1+0.31)*(2-0.48)*(2+0.51)
=(17+5.27)*(2-0.48)*(2+0.51)
=22.27*(2-0.48)*(2+0.51)
=(44.54-10.6896)*(2+0.51)
=33.8504*(2+0.51)
=67.7008+17.263704
=84.964504
=4.25*4*1.31*1.52*2.51
=17*(1+0.31)*(2-0.48)*(2+0.51)
=(17+5.27)*(2-0.48)*(2+0.51)
=22.27*(2-0.48)*(2+0.51)
=(44.54-10.6896)*(2+0.51)
=33.8504*(2+0.51)
=67.7008+17.263704
=84.964504
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