Question

-4^2/(-8/5)-5/6*(-3^2/2)=?

Answer 1

1*2*2/3+2*3*2/4+3*4*2/4+3*4*2/5+4*5*2/6+5*6*2/7+6*7*2/8+7*8*2/9+8*9*2/10+9*10*2/11
=2(1*2/3+2*3/4+3*4/4+3*4/5+4*5/6+5*6/7+6*7/8+7*8/9+8*9/10+9*10/11)
=2(1-1/3+2(1-1/4)+3+3*(1-1/5)+4*(1-1/6)+5*(1-1/7)+6*(1-1/8)+7*(1-1/9)+8*(1-1/10)+9*(1-1/11))
=2(1-1/3+2-1/2+3+3-3/5+4-2/3+5-5/7+6-3/4+7-7/9+8-4/5+9-9/11)
=2(48-1/3-1/2-3/5-2/3-5/7-3/4-7/9-4/5-9/11)
=2(48-1-7/5-5/7-5/4-7/9-9/11)
=2(42+551/13860)
=84又551/6930