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2分之一a -(2a-3分之2b的平方)+(-2分之3+2b的平方) =a/2-2a+2b²;/3-3/2+2b²; =-3a/2+8b²;/3-3/2 =-3/2*(-2)+8/3*(3/2)²;-3/2 =3/2(-2+8/3*3/2-1) =3/2*(-3+4) =3/2
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