Question

7/13×5/11+5/13×4/11

7/13×5/11+5/13×4/11

Answer 1

7/13×5/11+5/13×4/11巧算的结果等于5/13。

解：7/13×5/11+5/13×4/11

=(7x5)/(13x11)+(5x4)/(13x11)

=5/13x7/11+5/13x4/11

=5/13x(7/11+4/11)

=5/13x(7+4)/11

=5/13x11/11

=5/13

扩展资料

分数的单位是1

5/8的分数单位是1/8

它有5个这样的分数单位，再加上3个这样的分数单位，就等于一。

分数单位是指把单位1平均分成若干份，取其中一份的数，也就是说分子是1，分母是正整数的分数。5/8的分数单位是1/8，共包含5个同样的分数单位。再加上3个同样的分数单位等于1。

Answer 2

7/13×5/11+5/13×4/11
=5/13×7/11+5/13×4/11 乘法交换律
=5/13×（7/11+4/11）
=5/13×11/11
=5/13

Answer 3

7/13×5/11+5/13×4/11
=(7×5)/(13×11)+(5×4)/(13×11)
=(35+20)/(13×11)
=55/(13×11)
=5/13

Answer 4

7/13×5/11+5/13×4/11
=7/13×5/11+4/13×5/11
=(7/13+4/13)×5/11
=11/13×5/11
=5/13

Answer 5

7/13×5/11+5/13×4/11 =7/13×5/11+4/13×5/11 =(7/13+4/13)×5/11 =11/13×5/11 =5/13