3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x)因式分解
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3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x)因式分解3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x)因式分解3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x
3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x)因式分解
3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x)
因式分解
3(2x-7y)(7y+2x)+(4x+5y)(-5y-4x)因式分解
=3(4x²-49y²)-(4x+5y)²
=-4x²-40xy-172y²
=-4(x²+10xy-43y²)
原式=3(4x²-49y²)-(16x²+40xy+25y²)
=12x²-147y²-16x²-40xy-25y²
=-4x²-40xy-172y²
3(2x-7y)(2x+7y)-(4x+5y)^2
3(4x^2-49y^2)-(16x^2+40xy+25y^2)
12x^2-147y^2-16x^2-40xy-25y^2
-4x^2-122y^2-40xy
-4(x2+14y2+5xy)
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