(1/4)²- ³√8/125=
7/2-[(2/8-1/4×3/2)-(4/8÷1/2+7)]
√25/81-(1/5)³+(200)⁰
(1/5-2/7+1/3)+(1000/50)⁰
[(9/7-1/4)+(3/8×1/2)]​