If x + y = 4, xy = 1. Find the value of (1) x & # 178; + Y & # 178; (2) (X-Y) &# 178;

If x + y = 4, xy = 1. Find the value of (1) x & # 178; + Y & # 178; (2) (X-Y) &# 178;

x+y=4
(x+y)²=x²+y²+2xy=16
x²+y²=16-2=14
(x-y)²=x²+y²-2xy=14-2=12

If 3x = 7Y (XY is not equal to 0), what is the ratio of X to y

3x=7y
y=x*3/7
Positive proportion

If a and B are opposite to each other, C and D are reciprocal to each other, and the absolute value of M is 1, find the value of (a + b) cd-2014m

According to the meaning of the question: a + B = 0, CD = 1, M = 1 or - 1, when m = 1, the original formula = - 2014; when m = - 1, the original formula = 2014