6.5x12.8-6.5x2.8 简便计算

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6.5x12.8-6.5x2.8简便计算6.5x12.8-6.5x2.8简便计算6.5x12.8-6.5x2.8简便计算6.5x12.8-6.5x2.8=6.5x(12.8-2.8)=6.5x10=6

6.5x12.8-6.5x2.8 简便计算
6.5x12.8-6.5x2.8 简便计算

6.5x12.8-6.5x2.8 简便计算
6.5x12.8-6.5x2.8
=6.5x(12.8-2.8)
=6.5x10
=65

=6.5*(12.8-2.8)
=6.5*10
=65