Wykonaj dodawanie : a) (a do potęgi 2 + 2a) + (3a - 7) b) (2a - 3) + ( - 3a + 5) c) (3x do potęgi 2 + 2x - 1) + ( x do potęgi 2 - 3x + 2) d) (-3xy + 4 -y) + (2xy - 4y +1) zadanie 2 Wykonaj odejmowanie a) (2a do potęgi 2 - 5a + 4) - (-4a do potęgi 2 + 7a) b) ( a do potęgi 2 + a + 1) - ( 2a do potęg 2 + 2a) - (3a - 7) c) ( -2x do potęgi 2 y + 3y - 5) - (-3-8y) - ( 4 + 2x do potęgi 2 y)
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a)
(a²+2a)+(3a-7)=a²+5a-7
b)
(2a-3)+(-3a+5)=2a-3-3a+5=-a+2
c)
(3x²+2x-1)+(x²-3x+2)=4x²-x+1
d)
(-3xy+4-y)+(2xy-4y+1)=-xy-5y+5
2.
a)
(2a²-5a+4)-(-4a²+7a)=2a²-5a+4+4a²-7a=6a²-12a+4
b)
(a²+a+1)-(2a²+2a)-(3a-7)=a²+a+1-2a²-2a-3a+7=-a²-4a+8
c)
(-2x²y+3y-5)-(-3-8y)-(4+2x²y)=-2x²y+3y-5+3+8y-4-2x²y=-4x²y+11y-6