-5ab + (bc - 2 ab) + 4 cb= -5ab + bc - 2 ab + 4 cb = -7ab+5bc (5xyz-2xz)+(4zx-7zyx)= 5xyz-2xz+4zx-7zyx = -2xyz+2xz (m+n) - (2m+3n)=m+n - 2m -3n = -m-2n (2xy+4y²)-(3yx-2y²= 2xy+4y²-3yx+2y² = 6y²-xy 3abc-(2cab+5bac)= 3abc-2cab-5bac = -4abc 10x²y-(5xy²-8x²y= 10x²y-5xy²+8x²y = 18x²y-5xy²
a) -5ab + (bc - 2 ab) + 4 cb= -5ab + bc - 2ab=-7ab+bc b) (5xyz-2xz)+(4zx-7zyx)=5xyz-2xz+4zx-7zyx c) (m+n) - (2m+3n)=m+n-2m-3n=-m-2n d) (2xy+4y²)-(3yx-2y²)=2xy+4y²-3yx+2y²=2xy-3yx+6y² e) 3abc-(2cab+5bac)=3abc-2cab-5bac f)10x²y-(5xy²-8x²y)= 10x²y-5xy²+8x²y=18x²y-5xy² ;))
-5ab + (bc - 2 ab) + 4 cb= -5ab + bc - 2 ab + 4 cb= -3ab+5bc (5xyz-2xz)+(4zx-7zyx)=5xyz-2xz+4zx-7zyx=-2xyz+2zx (m+n) - (2m+3n)= m+n - 2m+3n=-m+4n (2xy+4y²)-(3yx-2y²=2xy+16y-3xy-4y=-xy+12y 3abc-(2cab+5bac)=3abc-2cab+5bac 10x²y-(5xy²-8x²y=100xy-25xy-64xy=66xy
