abc满足(1)1/3(a-5)^2+5|c|=0(2)-2x^2y^b-1与3x^2y^3是同类项,求(2a^2-3a
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abc满足(1)1/3(a-5)^2+5|c|=0(2)-2x^2y^b-1与3x^2y^3是同类项,求(2a^2-3ab+6b^2)-(3a^2-abc+9b^2
-4c^2)的值.
-4c^2)的值.
1/3(a-5)²+5|c|=0,
=> (a-5)²=0, |c|=0,
=> a=5, c=0;
是-2x²y^(b-1)与3x²y³是同类项还是-2x²(y^b)-1与3x²y³是同类项呢?
认为:-2x²y^(b-1)与3x²y³是同类项
=> b-1=3,
=> b=4;
=>(2a²-3ab+6b²)-(3a²-abc+9b²-4c²)
=-a²-3ab-3b²
=-5²-3×5×4-3×4²
=-133
=> (a-5)²=0, |c|=0,
=> a=5, c=0;
是-2x²y^(b-1)与3x²y³是同类项还是-2x²(y^b)-1与3x²y³是同类项呢?
认为:-2x²y^(b-1)与3x²y³是同类项
=> b-1=3,
=> b=4;
=>(2a²-3ab+6b²)-(3a²-abc+9b²-4c²)
=-a²-3ab-3b²
=-5²-3×5×4-3×4²
=-133
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