Matematică, întrebare adresată de Alexia13, 9 ani în urmă

1) Calculati si unde este cazul reduceti termenii asemenea :
b) +2(x+1)
d) -7(2x+1)-2(1-3x)+6x
f) 2√3(√3x-√2y)+3√2(√2x+√3y)
g)√3 (√2x-√3)-√2(√3x-√2)
2) b) (x-y)(x+y)
d)( x la put 2 -x)(2x la put 2 +x)
f) (2√2+5)+(3√2+1)
h) (4√2-1)(4√2+1)
j) (x-2√5)(4√5+x)

3) calculati
a) (x-4)(x+2)-3x(x+5)+8
b) 2x (x-2y)+3y(x-y)+(x-2y)(x-y)
c) 3√3(x+√3)-2√3(x-2√3)-√3x (-2+√3)
d) 1 intreg. si 1/2 x(-2x+6y)-2 intregi si 1/3y(9x-3y)+x-2y)(2x-y)
4) 2a:a
b) (-12 x la 2 y la 2):6x
h) - un intreg si 1/5 x la 2 : ( 1,2x)
5)
a) ( x la put 4 -,x la put 2 ):(-x)
c) (6x la 2 y la 2 - 8x la 3 y, la 2 ): (-2x la 2)
e) (24 a la put 3 b la 5 -32a la 2 b la put 4 +16ab la 3 ):(-8ab la put 2 )

6) b) 3√10:√5
d) 2√12 a: (-4a)
f) 2√2 ori (-3√5):(-2√5)
h) (√27+√75-√90): (-3)
7) stbiliti valoarea logica a propozitiilor:
a) ( x la put 2 +3)(x+4)=x la put 2 +7x+12
c) ( x la put 4 -2x la put 2 -x) :(-x) = -x la put 3 +2x +2

Răspunsuri la întrebare

Răspuns de renatemambouko
4
b) +2(x+1)= 2x+2
d) -7(2x+1)-2(1-3x)+6x= -14x-7-2+6x=-8x-9
f) 2√3(√3x-√2y)+3√2(√2x+√3y)=
=6x-2√6y+6x+3√6y=12x+√6y
g)√3 (√2x-√3)-√2(√3x-√2)=
=√6x-3-√6x+2=-1
2) b) (x-y)(x+y)=x²-y²
d)( x² -x)(2x² +x)=2x⁴-2x³+x³-x²=2x⁴-x³-x²
f) (2√2+5)+(3√2+1) =2√2+5+3√2+1 =5√2+6
h) (4√2-1)(4√2+1)=32-1=31
j) (x-2√5)(4√5+x)=4√5x-40+x²-2√5x= x²+2√5x-40 

3) calculati
a) (x-4)(x+2)-3x(x+5)+8=x²-4x+2x-8-3x²-15x+8= -2x²-17x
b) 2x (x-2y)+3y(x-y)+(x-2y)(x-y)=2x²-4xy+3xy-3y²+x²-2xy-xy+2y²=
=3x²-4xy-y²
c) 3√3(x+√3)-2√3(x-2√3)-√3x (-2+√3)= 3√3x+9-2√3x+12+2√3x-9x=
=3√3x-9x+21=
d) 1 intreg. si 1/2 x(-2x+6y)-2 intregi si 1/3y(9x-3y)+x-2y)(2x-y)=
=3x/2(-2x+6y)-7y/3(9x-3y)+(x-2y)(2x-y)=
=-3x²+9xy-21xy-7y²+2x²-4xy-xy+2y²=
=-x²-17xy-5y²

4) 2a:a =2
b) (-12 x²y²):6x=-2xy²
h) - un intreg si 1/5 x la 2 : ( 1,2x)=
=6x²/5:12x/10=6x²/5:6x/5=x
5) 
a) ( x⁴ -x² ):(-x)=-x³+x
c) (6x²y² - 8x³y²): (-2x²)=-3y²+4xy²
e) (24 a³b⁵ -32a²b⁴ +16ab³ ):(-8ab² )= -3a²b³ +4ab² -2b 

6) b) 3√10:√5 =3√2
d) 2√12 a: (-4a) = 4√3 a: (-4a) =-√3
f) 2√2 x (-3√5):(-2√5)= 2√2 x 3/2=3√2 
h) (√27+√75-√90): (-3) = 3√3+5√3-3√10=8√3-3√10
7) stabiliti valoarea logica a propozitiilor:
a) ( x² +3)(x+4)=x² +7x+12   fals
( x² +3)(x+4)=x³+3x+4x²+12
c) ( x⁴ -2x² -x) :(-x) = -x³ +2x +2    fals
( x⁴ -2x² -x) :(-x)=x³+2x+1
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