Question

0.2+(1/5)*(9/13)*(11/13)*20%

Answer 1

0.2+(1/5)*(9/13)+(11/13)*20%

=0.2*(1+9/13+11/13)

=0.2*33/13

=33/65

我想原题应该是“0.2 + 1/5 x 9/13 - 11/13 x 20%“的,这样的话可以作如下解答.

0.2 + 1/5 x 9/13 - 11/13 x 20%

= 1/5 + 1/5 x 9/13 - 11/13 x 1/5

= 1/5 x （1 + 9/13 - 11/13）

= 1/5 x 11/13

= 33/65