Question

Błagam o rozwiazanie to na jutro :(

Answer 1

2.3
a) (2a-3b) + (5a+9b) =2a-3b+5a+9b = 7a+6b
b) (13x+2y+2) - (24x-7y+27)= 13x+2y+2-24x+7y-27= - 11x+9y-25
c) (5a-11b+4) + (7a+8b) - (7b-8) = 5a-11b+4+7a+8b-7b+8 =
12a-10b+12
d) -(25x-y) + (31x+17) - (52x+26y -9)= -25x+y+31x+17-52x-26y+9= -46x-25y+26
 e) (3x² -4) - (18-4x²) + (15x²+7x -15)-25x =3x²-4-18+4x²+15x² +7x -15-25x= 22x² -18x-37
 f) (a³-ab +5) - (3a³-4) -(7a³-8ab)+(2ab-7)= a³-ab+5-3a³+ 4-7a³+ 8ab+2ab-7 =    = -9a³-9ab+2
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a) 4(x-7y)-8(2x-4y)+3(x-3y)+13=4x-28y-16x+32y+3x-9y+13= -9x-5y+13
b) 5a(-2b+1)+3b(9a-2)-(a-2b)= -10ab+5a-27ab-6b-a+2b= -37ab+4a-4b
c) 2,5x(4y-z)-4,5y(2x-z)+3,5z(5y-2x)=10xy-2,5xz-9xy+4,5yz+17,5yz-7xz=xy-9,5xz+22yz
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a)
3(x-2y)+x(x+2y-1)-2y(x+y-2)=3x-6y+x²+2xy-x-2xy-2y²+4y=x²-2y²+2x-2y
x=-1/2  y=-3
(-1/2)²-2*(-3)²+2*(-1/2)-2*(-3)=1/4-2*9-1+6=1/4-18+5=12 3/4

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a) 4(x-5y)+3(x+8y)=4x-20y+3x+24y=7x+4y
b) 5(a-2b-1)-3(a-4b)=5a-10b-5-3a+12b=2a+2b-5
c) 3(x-5)-7(3x-2)+5(7+5x)=3x-15-21x+14+35+25x=7x+34
d) 5a-4(a-3b+1)+8+(a-9b)=5a-4a+12b-4+8+a-9b=2a+3b+4
e) 5x+(18+4x+5y)-4(2x+3y)=5x+18+4x+5y-8x-12y=x-7y+18
f) -(2a-6b+6)-7(2b-3a+2)-5(4a-3b)=-2a+6b-6-14b+21a-14-20a+15b= -a+7b-20
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2.4
(x²+19y²-10x-2)+(5x²-7y²-3y-8x-13)+(3x²+11y²-6y+5)=x²+19y²-10x-2+5x²-7y²-3y-8x-13+3x²+11y²-6y+5=9x²+22y²-2x-9y-10
2.5
a)
(4x+3y)-(2x-7y+3)=4x+3y-2x+7y-3=2x+10y-3
b)
(12x²-y-3)-(2x²+3y-1)+(4x²-5y+18)=12x²-y-3-2x²-3y+1+4x²-5y+18=14x²-9y+16