原式=(-1/2)a-2[a-(1/2)b²]-[(3/2)a-(1/3)b²]
=(-1/2)a-2a+b²-(3/2)a+(1/3)b²
=[(-1/2)a-2a-(3/2)a]+[b²+(1/3)b²]
=-4a+(4/3)b²
=-4×(-2)+4/3×(2/3)²
=8+4/3×4/9
=8+16/27
=216/27+16/27
=232/27
原式=(-1/2)a-2[a-(1/2)b²]-[(3/2)a-(1/3)b²]
=(-1/2)a-2a+b²-(3/2)a+(1/3)b²
=[(-1/2)a-2a-(3/2)a]+[b²+(1/3)b²]
=-4a+(4/3)b²
=-4×(-2)+4/3×(2/3)²
=8+4/3×4/9
=8+16/27
=216/27+16/27
=232/27