Question

0.9除以1.3+130除以90+0.11除以0.13+1.4除以0.9+6除以13的简便运算方法,急

Answer 1

0.9/1.3+130/90+0.11/0.13+1.4/0.9+6/13

=(0.9/1.3+0.11/0.13+6/13)+(130/90+1.4/0.9)

=(9/13+11/13+6/13)+(13/9+14/9)

=(9+11+6)/13+(13+14)/9

=26/13+27/9

=2+3

=5