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a fost răspuns

Calcul prescurtat
x(x-1)+(x+1)la a 2a =?

2(x-1)la a 2a × X-2x la a3a =?

√2x(x-1)la a2a - √2x la a3a=?

Răspuns :

MFM
a) x²-x+x²+2x+1=2x²+x+1
b) 2x(x²-2x+1)-2x³=2x³-4x²+2x-2x³=-2x(2x-1)
sau folosind formula (a²-b²)=(a-b)(a+b)
 2x(x-1-x)(x-1+x)=-2x(2x-1)
c) √2x[(x-1)²-x²]=√2x(x-1-x)(x-1+x)=-√2x(2x-1)

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