Factoriser les expressions suivantes :
A=5(3x-2)-21x²+14x
B=(x-3)²-(x-3)(7x-1)
C=(x+y)²-x(x+y)+1/4x²
D=16/25x²-4
E=9x²-30x+25
F=x²+x+1/4+(2x+1)(3-x)
G=4x²+9xy+5y²
A=5(3x-2)-21x²+14x
B=(x-3)²-(x-3)(7x-1)
C=(x+y)²-x(x+y)+1/4x²
D=16/25x²-4
E=9x²-30x+25
F=x²+x+1/4+(2x+1)(3-x)
G=4x²+9xy+5y²
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A=5(3x-2)-21x²+14x =5(3x-2) -7x(3x-2) = (3x-2)(5-7x)
B=(x-3)²-(x-3)(7x-1) =(x-3)(x-3-7x+1) =(x-3)(-6x-2)
C=(x+y)²-x(x+y)+1/4x² ??
D=16/25x²-4 = (4/5x-2)(4/5x+2)
E=9x²-30x+25 =(3x-5)²
F=x²+x+1/4+(2x+1)(3-x) = (x+1/2)² +(2x+1)(3-x) = ??
G=4x²+9xy+5y² = ??