Proszę o pomoc w zadaniu z załącznika :D Zadanie 20 i 22 :D Daje naj!!!
20.
a) (m+n)(m-2) + (m-n)(m+1) = m²+-2m+mn-2n + m²+m-mn-n = 2m²-m-3n
b) (3x-2)(3x-2y+1)-4x(2x-3y+1) = 9x²-6xy+3x-6x+4y-2 -8x²+12xy-4x = x²+6xy-7x+4y-2
c) 3(m+1)(n-2) +2(n+1)(m-2) = 3(mn-2m+n-2) +2(mn-2n+m-2)= 3mn-6m+3n-6 + 2mn-4n+2m-4 = 5mn-4m-n-10
d) x(x+1)(x+2) -x(x-1)(x-2) = x(x²+2x+x+2) -x(x²-2x-x+2) = x³+2x²+x²+2x -x³+2x²+x²-2x = 6x²
22.
a) (6x*4x)-(½*6x*2)-(½*6x*2)=24x-6x-6x=12x
b) a *(h +3) (a-4)h a h 3a a h 4h 3a
----------- - ------ = ----- + ---- - ----- + ----- = ---- +2h
2 2 2 2 2 2 2
liczęna NAJL.
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20.
a) (m+n)(m-2) + (m-n)(m+1) = m²+-2m+mn-2n + m²+m-mn-n = 2m²-m-3n
b) (3x-2)(3x-2y+1)-4x(2x-3y+1) = 9x²-6xy+3x-6x+4y-2 -8x²+12xy-4x = x²+6xy-7x+4y-2
c) 3(m+1)(n-2) +2(n+1)(m-2) = 3(mn-2m+n-2) +2(mn-2n+m-2)= 3mn-6m+3n-6 + 2mn-4n+2m-4 = 5mn-4m-n-10
d) x(x+1)(x+2) -x(x-1)(x-2) = x(x²+2x+x+2) -x(x²-2x-x+2) = x³+2x²+x²+2x -x³+2x²+x²-2x = 6x²
22.
a) (6x*4x)-(½*6x*2)-(½*6x*2)=24x-6x-6x=12x
b) a *(h +3) (a-4)h a h 3a a h 4h 3a
----------- - ------ = ----- + ---- - ----- + ----- = ---- +2h
2 2 2 2 2 2 2
liczęna NAJL.