(1.2+2.3+3.4+4.5+5.6+6.7)/(12+23+34+45+56+67)
1个回答

(1.2+2.3+3.4+4.5+5.6+6.7)/(12+23+34+45+56+67)

=(1.2+2.3+3.4+4.5+5.6+6.7)/10(1.2+2.3+3.4+4.5+5.6+6.7)

=1/10