计算①(1+x+2y)^2 ②(2x-7y)(3x+4y-1)
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计算①(1+x+2y)^2 ②(2x-7y)(3x+4y-1)
计算①(1+x+2y)^2 ②(2x-7y)(3x+4y-1)
计算①(1+x+2y)^2 ②(2x-7y)(3x+4y-1)
(1+x+2y)²
=[(x+1)+(2y)]²
=(x+1)²+(x+1)(2y)+(2y)²
=x²+2x+1+2xy+2y+4y²
=x²+2xy+4y²+2x+2y+1
(2x-7y)(3x+4y-1)
=2x(3x+4y-1)-7y(3x+4y-1)
=(6x²+8xy-2x)-(21xy+28y²-7y)
=6x²-28y²-13xy-x+7y
计算①(1+x+2y)^2 ②(2x-7y)(3x+4y-1)
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