21.6×6.7+23×21.6+21.6怎样简便计算
21.6×6.7+23×21.6+21.6=
21.6（6.7+23+1）=
21.6×30.7=663.12
简便计算结果为663.12
21.6X（6.7+23+1）=21.6×30.7=663.12乘法结合律
21.6x6.7+23x21.6+21.6
=21.6x6.7+23x21.6+21.6×1
=21.6×（6.7+23+1）
=21.6×（30+0.7）
=21.6×30+21.6×0.7
=648+15.12
=663.12
21.6×6.7+23×21.6+21.6=21.6*（6.7+23+1）=21.6*30.7=663.12
=21.6×（6.7+23+1）
=21.6×30.7
=633.12
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