2.解方程。(建议4分钟完成)-|||-dfrac (3)(8)x-5% x=6.5-|||--dfrac (3)(5)=80% -|||-dfrac (1)(10)+dfrac (9)(10)x+dfrac (1)(5)x=dfrac (1)(2)-|||-dfrac (3)(8)div x=dfrac (9)(10)-|||-dfrac (4)(5)x+1.2times 50% =28.6-|||-(32% +x)times dfrac (1)(4)=50%