若a-2b/a+2b=3.求a+2b/a-2b+3a-6b/4a+8b=?注；/前是分子,后是分母,求结果

若a-2b/a+2b=3.求a+2b/a-2b+3a-6b/4a+8b=?注；/前是分子,后是分母,求结果
若a-2b/a+2b=3.求a+2b/a-2b+3a-6b/4a+8b=?注；/前是分子,后是分母,求结果

若a-2b/a+2b=3.求a+2b/a-2b+3a-6b/4a+8b=?注；/前是分子,后是分母,求结果
(a-2b)/(a+2b)=3
a-2b=3a+6b
2a=8b
a=4b
a+2b/a-2b+3a-6b/4a+8b=(4b+2b)/(4b-2b)+(12b-6b)/(16b+8b)=6/2+6/24=3+1/4=13/4

因为 (a-2b)/(a+2b)=3
所以 (a+2b)/(a-2b)=1/3
(3a-6b)/(4a+8b)=3(a-2b)/4(a+2b)=3/4 *(a-2b)/(a+2b)= 3/4 * 3=9/4
（a+2b)/(a-2b)+(3a-6b)/(4a+8b)=1/3+9/4=31/12