简便计算:72*55+28*56=( )

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简便计算:72*55+28*56=()简便计算:72*55+28*56=()简便计算:72*55+28*56=()刘晶美,72×55+28×56=72×55+28×55+28=55×(72+28)+2

简便计算:72*55+28*56=( )
简便计算:72*55+28*56=( )

简便计算:72*55+28*56=( )
刘晶美,
72×55+28×56
=72×55+28×55+28
=55×(72+28)+28
=55×100+28
=5500+28
=5528

72×55+28×56
=72×55+28×55+28
=55×(72+28)+28
=55×100+28
=5500+28
=5528
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(72+28)*55+28=5528