-2/3+（-5/6）-（-1/9）-1/6
= -2/3-5/6+1/9-1/6
= -12/18-15/18+2/18-3/18
= -28/18
= -14/9
{1-（-1/4）}×{（-2）的三次方+（-3）的二次方}
=(1+1/4)*(-8+9)
=5/4*1
=5/4