Question

简便计算:17分之8*13分之4+17分之4*13分之9

Answer 1

8/17*4/13+4/17*9/13

=4/17*8/13+4/17*9/13

=4/17*(8/13+9/13)

=4/17*17/13

=4/13

27/14÷(27/28+3)

=27/14÷111/28

=27/14*28/111

=27*2/111

=9*2/37

=18/37