8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号
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8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号8x²-[-3x-(2x²
8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号
8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号
8x²-[-3x-(2x²-7x-5)+3]+4x怎么变号
8x²-[-3x-(2x²-7x-5)+3]+4x
=8x²-(-3x-2x²+7x+5+3)+4x
=8x²-(-2x²+4x+8)+4x
=8x²+2x²-4x-8+4x
=10x²-8
8x²-[-3x-(2x²-7x-5)+3]+4x
=8x²-[-3x-2x²+7x+5+3]+4x
=8x²-[-2x²+4x+8]+4x
=8x²+2x²-4x-8+4x
=10x²-8