请在下面几个加减乘除四则混合算式的()里各填同一个数,使算式成立!

问题描述:

请在下面几个加减乘除四则混合算式的()里各填同一个数,使算式成立!
()+()-()X()/()=1/4
()+()-()X()/()=3/2
()+()-()X()/()=2.85

(1/4)+(1/4)-(1/4)X(1/4)/(1/4)=1/4
(3/2)+(3/2)-(3/2)X(3/2)/(3/2)=3/2
(2.85)+(2.85)-(2.85)X(2.85)/(2.85)=2.85