用简便方法计算 0.28×8.6+7.2×0.86 999×778+333×666 怎样写?
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用简便方法计算0.28×8.6+7.2×0.86999×778+333×666怎样写?用简便方法计算0.28×8.6+7.2×0.86999×778+333×666怎样写?用简便方法计算0.28×8.
用简便方法计算 0.28×8.6+7.2×0.86 999×778+333×666 怎样写?
用简便方法计算 0.28×8.6+7.2×0.86 999×778+333×666 怎样写?
用简便方法计算 0.28×8.6+7.2×0.86 999×778+333×666 怎样写?
0.28×8.6+7.2×0.86
=0.28*8.6+0.72*8.6
=(0.28+0.72)*8.6
=1*8.6
=8.6
999×778+333×666
=999*778+333*3*222
=999*(778+222)
=999*1000
=999000