初一数学计算::3x²-[5x-(1/2x-3)+2x²]
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3x²-[5x-(1/2x-3)+2x²]
=3x²-[5x-1/2x+3+2x²]
=3x²-[9/2x+3+2x²]
=3x²-9/2x-3-2x²
=3x²-2x²-9/2x-3
=x²-9/2x-3
=3x²-[5x-1/2x+3+2x²]
=3x²-[9/2x+3+2x²]
=3x²-9/2x-3-2x²
=3x²-2x²-9/2x-3
=x²-9/2x-3
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展开全部
3x²-[5x-(1/2x-3)+2x²]
=3x²-(5x-1/2x+3+2x²)
=3x²-5x+1/2x-3-2x²
=x²-(9/2)x-3
=3x²-(5x-1/2x+3+2x²)
=3x²-5x+1/2x-3-2x²
=x²-(9/2)x-3
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