Three times the product of two numbers x and y divided by a third number z
0.5*xy
3x over x + y
(x + y)/2 ------------
1/2 (x+y)
8 , and 7. x+y=15 >> x=-y+15 x*y=56 >> y*(-y+15)=56 , then solve for y , put y back into either equation for x.
0.5xy or xy/2
0.5*xy
The sum of x and y decreased by their product is (x + y)- xy.
3x over x + y
x times y or, symbolically, either x*y or simply xy (where context allows, also X x Y)
X^2y
The equation would be x=y/2 or y=2x
(x + y)/2 ------------
x equals half y
3tx and y
A binary function is a function f if there exists sets X, Y, and Z, such that f:X x Y -> Z where X x Y is the cartesian product of X and Y.
It depends what the special product is. Common special products are: - perfect square trinomials ... x^2 + 2ax + a^2 = (x + a)^2 - difference of squares ... x^2 - y^2 = (x - y)(x + y)