Question

1. Calculati : a) -18x^5 : ( 3x^2 )^2 + 27x^4 : ( -3x^3 )
b) Calculati : ( x + 4)^2 - 3 (x-3)(x+3)+2 (x-1)^2
2. Calculati : a) 2 ( 3 -5x ) + 7x
b) Calculati : ( 3x-2)(x+2) - 3x^2
c) Efectuati : (56x^2 - 28x^3 ) : 28x^2 + x
d) Calculati : (5x^2)^2 : 5x^3 - 27x^5 :( -9x^4)
e) Calculati : (2x+1)^2 - 6 ( x-2)(x+2)+2(x-3)^2
VA ROG ! VA DAU CE VRETI . VREAU REZOLVARE COMPLETA

Answer 1

1.a)-18x·5:(3x·2)+27x·4:(-3x·3)=
=-90x:6x+108x:(-9x)=
=-15-12=
=-27
b)(x+4)·2-3(x-3)(x+3)+2(x-1)·2=
=2x+8-3(x²-9)+(2x-2)·2=
=2x+8-3x²+27+4x-4=
=6x+31-3x²

2.a)2(3-5x)+7x=
=6-10x+7x=
=6-17x
b)(3x-2)(x+2)-3x·2=
=3x²+6x-2x-4-6x=
=3x²-2x-4
c)(56x·2-28x·3):28x·2+x=
=(112x-84x):56x+x=
=28x:56x+x=
=28x·1/56x + x=
=1/2 + x
d)(5x·2)·2:5x·3-27x·5:(-9x·4)=
=10x·2:15x-135x:(-36x)=
=20x·1/15x-135x·1/-36x=
=4/3-135/-36 ( amplificam prima fractie cu -12 ca sa aducem la acelasi numitor) =
=-48/36-135/36=
=-183/36=
=-61/12
e)(2x+1)·2-6(x-2)(x+2)+2(x-3)·2=
=2x+2-6(x²-4)+(2x-6)·2=
=2x+2-6x²+24+4x-12=
=6x+14-6x²