3x²-[7x-(4x-3)-2x²]快给答案着急
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3x²-[7x-(4x-3)-2x²]快给答案着急3x²-[7x-(4x-3)-2x²]快给答案着急3x²-[7x-(4x-3)-2x²]快
3x²-[7x-(4x-3)-2x²]快给答案着急
3x²-[7x-(4x-3)-2x²]
快给答案着急
3x²-[7x-(4x-3)-2x²]快给答案着急
=3x²-7x+（4x-3）+2x²
=3x²-7x+4x-3+2x²
=5x²-3x-3
=3x²-[7x-4x+3-2x²]
=3x²-3x-3+2x²
=5x²-3x-3