Question

1,2,3 zadanie w zalaczniku

Answer 1

zad1

a) -2(3a +5b)+3(4b-6a)= -6a-10b+12b-18a= -24a +2b

b)-7(x-3y+1/7z-2)-3(y+x+z)-18y= -7x+21y-z+14-3y-3x-3z-18y= -10x-4z

c) 2(1/2a + 0.25b)-4(1,25a-3/4b)-a+b= a+1/2b-5a+3b-a+b=-5a+3 1/2b

d) -1/3(2,1x^2-4 1/5y^2)+y^2 +5x^2+6(2/3y^2-1 1/3x^2)= -7/10x^2+14/10y^2+y^2+5x^2+4y^2-8x^2=-3,7x^2+6,4y^2

 

zad2

a)x(y+z-1/2)-5(x-4xz-xy)+5,5x= xy+xz-1/2x-5x+20xz+5xy+5,5x=6xy+21xz

b)6x(2x^4+3x^3-4x^2-2x)-3x^2(x^3+6x^2+6x)+30x^3= 12x^5+18x^4-21x^3-12x^2-3x^5-18x^4-18x^3+30x^3=9x^5-9x^3-12x^2

c)7(1-y)-7[2x^2-5xy^2-6x(x^2-2y^2)]+14x^2(1-3x)= 7-7y-14x^2+35xy^2+42x^3-84x^3+14x^2-42x^3=7-7y-84x^3+35x^2