13/49×21+13×28/49简便算法

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13/49×21+13×28/49简便算法13/49×21+13×28/49简便算法13/49×21+13×28/49简便算法13/49×21+13×28/49=13/49×(21+28)=13/49

13/49×21+13×28/49简便算法
13/49×21+13×28/49简便算法

13/49×21+13×28/49简便算法
13/49×21+13×28/49
=13/49 ×(21+28)
=13/49 ×49
=13

13/49×21+13×28/49
=13/49*(21+28)
=13/49*49
=13

=13x(21/49+28/49)=13x49/49=13

13/49×21+13×28/49
=13×(21+28)/49
=13×49/49
=13

13/49×21+13×28/49=13/7*3+13*4/7=13/7*(3+4)=13

13/49×21+13×28/49
=13/49*(21+28)
=13/49*49
=13

13/49*21+13*28/49
=13*(21/49+28/49)
=13