factoriser : ( les x sont des x pas des fois)
t²+81+18t
4x²-4xy+y²
x²-16
1-y²
100x²-9
100+60x+9x²
t²+81+18t
4x²-4xy+y²
x²-16
1-y²
100x²-9
100+60x+9x²
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=t²+2*9*t+9²
=(t+9)²
4x²-4xy+y²
=(2x)²-2*2x*y+y²
=(2x-y)²
1-y²
=1²-y²
=(1-y)*(1+y)
100x²-9
=(10x)²-3²
=(10x+3)*(10x-3)
100+60x+9x²
=10²+2*10*3x+(3x)²
=(10+3x)²