原式={22/3-{(49/3-49/4)-(63/4-63/5)+(77/5-77/6)-(91/6-91/7)+(105/7-105/8)}}/32
=(-27/3+112/4-140/5+168/6-196/7+105/8)/32
=(-9+28-28+28-28+105/8)/32
=(33/8)/32
=33/256
原式={22/3-{(49/3-49/4)-(63/4-63/5)+(77/5-77/6)-(91/6-91/7)+(105/7-105/8)}}/32
=(-27/3+112/4-140/5+168/6-196/7+105/8)/32
=(-9+28-28+28-28+105/8)/32
=(33/8)/32
=33/256