至少3个算式,是吧?
(1/4 ÷ 1/4) - (1/4 + 1/4) = 1/2
1/4 + 1/4 + 1/4 - 1/4 = 1/2
(1/4 ÷ 1/4) x (1/4 + 1/4) = 1/2