3(2x+1)(2x-1)-4[(3)/(2)x-3][(3)/(2)+3]
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3(2x+1)(2x-1)-4[(3)/(2)x-3][(3)/(2)+3]
5(2x+5)2+(3x-4)(-3x-4)
(2x+y-z+5)(2x-y+z+5)
[(7)/(3)x+(3)/(2)y]2
5(2x+5)2+(3x-4)(-3x-4)
(2x+y-z+5)(2x-y+z+5)
[(7)/(3)x+(3)/(2)y]2
3(2x+1)(2x-1)-4[(3)/(2)x-3][(3)/(2)+3]
=3(4X^2-1)-4(9/4x^2-9)
=12x^2-3-9x^2+36
=3x^2+33
5(2x+5)2+(3x-4)(-3x-4)
=20x+50-9x^2+16
=9x^2+20x+66
(2x+y-z+5)(2x-y+z+5)
同上,注意平方差公式应用.
[(7)/(3)x+(3)/(2)y]2
=3(4X^2-1)-4(9/4x^2-9)
=12x^2-3-9x^2+36
=3x^2+33
5(2x+5)2+(3x-4)(-3x-4)
=20x+50-9x^2+16
=9x^2+20x+66
(2x+y-z+5)(2x-y+z+5)
同上,注意平方差公式应用.
[(7)/(3)x+(3)/(2)y]2
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
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