(x+y+z)*3=
Using the 'Order of Operation' rules, the addition within brackets is done first, then the sum is multiplied by 3 (thrice means three).
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x*(y+z) = x*y + x*z This is the distributive property of multiplication over addition.
mid point of xy
The mixed fraction XY/Z is equal to (XZ + Y)/Z.
y(z+x) + 4(x+z)
(1/x) - (1/y) = (1/z) Get the left-hand side over a common denominator:- (y-x)/xy = 1/z Take the reciprocal of both sides:- z = xy / (y-x)