1题：
原式=[-0.5²+(-1/2)²-|-2²-4|+(2又1/4)²×16/27]÷0.1²
=[-(1/2)²+1/4-|-4-4|+(9/4)²×16/27]÷(1/10)²
=(-1/4+1/4-8+81/16×16/27)÷1/100
=(-8+3)×100
=-5×100
=-500
2题：
原式=1又1/2×[3×(-2/3)²-1]-1/3×[(-2)²-(-4.5÷3)]
=3/2×(3×4/9-1)-1/3×(4+1.5)
=3/2×1/3-1/3×11/2
=(3/2-11/2)×1/3
=-4×1/3
=-4/3