-3/2×【(-2/3)²-2】=-3/2×(4/9-2)=-3/2×(-14/9)=7/34x²+3xy-x²-9=4×2²+3×2×(-3)-2²-9=16-18-4-9=-15上面的是正确的
-3/2×【(-2/3)²-2】=-3/2×(4/9-2)=-3/2×(-14/9)=7/34x²+3xy-x²-9=4×2²+3×2×(-3)-2²-9=16-18-4-9=-15
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