Question

Usuń nawiasy i zredukuj wyrazy podobne.

a) -2(3a + 5b) + 3(4b-6a)

b) -7(x - 3y + 1/7z - 2) - 3(y + x + z) - 18y

c) 2(1/2a + 0,25b) - 4(1,25a - 3/4b) - a + b

d) -1/3(2,1x² - 4⅕y²) + y2 + 5x² + 6(2/3y² - 1⅓x²)

Answer 1

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-1z+14-3y-3x-3z-18y=-10x-4z+14

c) 2(1\2a+0,25b)-4(1,25a-3\4b)-a+b=1a+1\2b-5a+3b-a+b=-5a+4,5b

d) -1\3(2,1x^2-40y^2)+y^2+5x^2+6(2\3y^2-3\2x^2)=-7\10x^2+40\3y^2+y^2+

   +5x^2+4y^2-9x^2=-47\10x^2+18 1\3y^2