计算:3x²-[5x-(1/2 x-3)+2x²]
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计算:3x²-[5x-(1/2 x-3)+2x²]
计算:3x²-[5x-(1/2 x-3)+2x²]
计算:3x²-[5x-(1/2 x-3)+2x²]
3x²-[5x-(1/2 x-3)+2x²]
=x²-9/2 x-3
3x²-[5x-(1/2 x-3)+2x²]
=3x²-[5x-1/2 x+3+2x²]
=3x²-9/2 x-3-2x²
=x²-9/2x-3
原式=3x²-【5x-1/2x+3+2x²】=3x²-5x+1/2x-3-2x²=x²-9/2x-3
3x²-[5x-(1/2 x-3)+2x²]
=3x²-(5x-1/2 x+3+2x²)
=3x²-5x+1/2 x-3-2x²
=x²-4又1/2x-3