已知需求zhi出7/12-1/4等於幾分dao之幾X - Y = Z. ∴7/12 - 1/4. = 7/12 - (1×內3)/(4×3)= 7/12 - 3/12. = (7-3)/12. = 4/12. = 1/3. 答:容7/12-1/4 ...
確定! 回上一頁