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
=0.50.5*0.15不等于0.25*37.8*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=630.50.85*0.5+0.25*3=0.25*1.7+0.25*3=0.25*(1.7+3)=0.25*4+0.25*0.7=1+0.175=1.175看错小数点了
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
数学人气:707 ℃时间:2020-02-03 17:54:33
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