(-3)³+5²-(-2)²
=-27+25-4
=25-(27+4)
=25-31
=-6
-8÷(-4又1/2)÷(-2又2/3)
=-8÷(-9/2)÷(-8/3)
=-8×(-2/9)×(-3/8)
=-(8×2/9×3/8)
=-2/3