13*39*(5/39 1/13)简便方法计算?
发布网友
共2个回答
热心网友
简便计算
13x39x(5/39+ 1/13)
=13x39x5/39+13x39x1/13
=13x（39x5/39）+39x（13x1/13）
=13x5+39x1
=65+39
=104
热心网友
13×39×(5/39+1/13)
=13×39×5/39+13×39×1/13
=65+39
=104
热心网友
简便计算
13x39x(5/39+ 1/13)
=13x39x5/39+13x39x1/13
=13x（39x5/39）+39x（13x1/13）
=13x5+39x1
=65+39
=104
热心网友
13×39×(5/39+1/13)
=13×39×5/39+13×39×1/13
=65+39
=104
