Question

A=2×+5y+1 B=3y-7×-8 C=12×-y Calcule

a)A+B+C

b)A-B-C

c)B-A+C

d)C-A-B

Answer 1

A=2×+5y+1 B=3y-7×-8 C=12×-y Calcule

a)A+B+C = 2×+5y+1+3y-7×-8+12×-y = 7x -7y -7

b)A-B-C = 2×+5y+1-(3y-7×-8)-(12×-y) = 2×+5y+1-3y+7×+8-12×+y = -3x+3y+9

c)B-A+C = 3y-7×-8 -(2×+5y+1)+12×-y = 5x+2y-8-2x-5y-1 = 3x-3y-9

d)C-A-B = 12×-y-(2×+5y+1)-(3y-7×-8) = 12x-y-2x-5y-1-3y+7x+8 = 17x-9y+7