L'énoncé
Cocher la bonne réponse.
Tu as obtenu le score de
Question 1
$(x+2)^2=$
$x^2+2x+2$
$x^2+2x+4$
$x^2+4x+4$
Question 2
$(3x+1)^2=$
$3x^2+3x+1$
$9x^2+6x+1$
$(3x+1)^2=(3x)^2+2\times 3x\times 1+1^2$
$(3x+1)^2=9x^2+6x+1$
$3x^2+6x+1$
Question 3
$(x-5)(x+5)=$
$x^2-25$
$(x-5)(x+5)=(x)^2-(5)^2$
$(x-5)(x+5)=x^2-25$
$5x^2-25$
$x^2-5$
Question 4
$(x-4)^2=$
$x^2-16x-16$
$x^2-16x+16$
$x^2-8x+16$
$(x-4)^2=x^2-2\times x\times 4+4^2$
$(x-4)^2=x^2-8x+16$
Question 5
$(3x-5)(3x+5)=$
$9x^2-25$
$(3x-5)(3x+5)=(3x)^2-(5)^2$
$(3x-5)(3x+5)=9x^2-25$
$3x^2-25$
$9x^2+25$
Question 6
$(3x-4)^2=$
$3x^2-24x+16$
$9x^2+24x+16$
$9x^2-24x+16$
$(3x-4)^2=(3x)^2-2\times 3x\times 4+4^2$
$(3x-4)^2=9x^2-24x+16$
Question 7
$(6x+1)(6x-1)=$
$36x^2-1$
$(6x+1)(6x-1)=(6x)^2-(1)^2$
$(6x+1)(6x-1)=36x^2-1$
$36x^2+12x+1$
$36x^2-12x+1$
Question 8
$(0,1x + 10)^2=$
$100x^2+2x+0,01$
$0,01x^2+2x+100$
$(0,1x + 10)^2=(0,1x)^2+2\times 0,1x\times10 +10^2$
$(0,1x + 10)^2=0,01x^2+2x+100$
$0,01x^2+x+100$
Question 9
$(0,05x - 10)^2=$
$0,0025x^2-x+100$
$(0,05x - 10)^2=(0,05x)^2-2\times 0,05x\times10+10^2$
$(0,05x - 10)^2=0,0025x^2-x+100$
$0,025x^2-x+100$
$0,0025x^2-5x+100$
Question 10
$\left(3x+\dfrac{2}{5}\right)^2=$
$9x^2+\dfrac{12}{5}x+\dfrac{4}{25}$
$\left(3x+\dfrac{2}{5}\right)^2=(3x)^2+2 \times 3x\times \dfrac{2}{5}+\left(\dfrac{2}{5}\right)^2$
$\left(3x+\dfrac{2}{5}\right)^2=9x^2+\dfrac{12}{5}x+\dfrac{4}{25}$
$9x^2+\dfrac{12}{5}x+\dfrac{2}{5}$
$9x^2+\dfrac{6}{5}x+\dfrac{4}{25}$
$(x+2)^2=x^2+2\times x\times 2+2^2$
$(x+2)^2=x^2+4x+4$