7.8*80+6.5和0.85*0.5+0.25*3的简便算法

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7.8*80+6.5和0.85*0.5+0.25*3的简便算法7.8*80+6.5和0.85*0.5+0.25*3的简便算法7.8*80+6.5和0.85*0.5+0.25*3的简便算法7.8*80+

7.8*80+6.5和0.85*0.5+0.25*3的简便算法
7.8*80+6.5和0.85*0.5+0.25*3的简便算法

7.8*80+6.5和0.85*0.5+0.25*3的简便算法
7.8*80+6.5
=1.3*5*6*16+6.5
=6.5*(96+1)
=6.5*97
=6.5*(100-3)
=6.5*100-6.5*3
=650-19.5
=630.5
0.85*0.5+0.25*3
=0.85*0.5+0.5*0.15
=(0.85+0.15)*0.5
=1*0.5
=0.5