(根号8-2倍根号0.25)-(根号9/8+根号50+2/3倍根号72)

问题描述:

(根号8-2倍根号0.25)-(根号9/8+根号50+2/3倍根号72)

√表示根号,√8=2√2,0.25=1/4,√(1/4)=1/2,√9=3,√50=5√2,√72=6√2.
原式得:(2√2-1)-(3/(2√2)+5√2+4√2),
=2√2-1-3√2/4-5√2-4√2
化简得:-(31/4)√2-1