If x + y = 10, the square of x minus the square of Y equals 140, try to find the value of X and y

If x + y = 10, the square of x minus the square of Y equals 140, try to find the value of X and y

x^2-y^2=140
(x+y)(x-y)=140
10(x-y)=140
x-y=14
x+y=10
x=(14+10)/2=12
y=(14-10)/2=2

The square of 5x minus 4xy plus the square of y plus 2x plus 1 equals 0. Find the value of x minus y

5x²-4xy+y²+2x+1=0
4x²-4xy+y²+x²+2x+1=0
(2x-y)²+(x+1)²=0
2x-y=0
x+1=0
So x = - 1, y = - 2
x-y=-1-(-2)=1

The atmospheric pressure received by the aircraft during flight is 9.932 times 10 Pascal. If the atmospheric pressure on the ground is standard atmospheric pressure, what is the altitude of the aircraft

The pressure on the top of the plane is much lower than that on the bottom. The plane flies by this pressure difference. The air pressure on the front of the plane is more than the standard atmospheric pressure. What pressure do you mean? If it is the average air pressure of the plane flying height, it should be about 198m

What is the difference between 3.5 times and 10.5? (solved by equation)

Let this number be x, 3.5x-10.5 = 0, & nbsp; & nbsp; & nbsp; & nbsp; 3.5x = 10.5, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 3

Hello, teacher. The larger the contact area, the greater the friction? The faster the movement speed, the greater the friction?

Friction is divided into two kinds, one is static friction, and the size of the external force
One is sliding friction, which is related to normal pressure and roughness of contact surface, but not to contact area and velocity

Help to solve the equation of one variable. 1 two digit, the number of one digit is 5 larger than that of ten digit
1 two digit, the number on the one digit is 5 larger than the number on the ten digit, and the sum of the number on the one digit and the number on the ten digit is 6 larger than 7 / 1 (one seventh) of the two digit
Just list the equations, and you'd better have the answers,

"Cyyls": I just saw your question this morning. I'm a little late in answering it. Let's set ten digits as a and single digit as a + 5. The equation is as follows: a + (a + 5) = 1 / 7 (10a + A + 5) + 62A + 5 = 11a / 7 + 5 / 7 + 6 (14a-11a) / 7 = 5 / 7 + 1 = 12 / 73a = 12a = 4A + 5 = 4 + 5 = 9

The distance between a and B is 40km, the speed of motorcycle is 45km / h, and the speed of freight car is 35km / h. The two cars go from a to B at the same time, and the freight car starts several hours first

16 out of 63 hours
40 out of 35-40 out of 45 = 16 out of 63

If the root sign (square of a + 2008) is an integer, find the positive integer a satisfying the condition to get the value

2008=4*502
2008+a=4*(502+a/4)
Because 22 * 22 = 484
23*23＝529
502-484

(2x + 3Y) & # 178; + 2 (2x + 3Y) + 4 = 0, then the value of 2x + 3Y is ()

A:
（2x+3y）²+2（2x+3y）+4=0
Taking 2x + 3Y as a whole, we simplify it with the square formula of sum
(2x+3y+1)²+3=0
2x+3y=±√3 i

There are two piles of sand. If 55 kg of sand is taken from the first pile and put into the second pile, the weight of the second pile is 5 / 7 of that of the first pile,
It is known that the second pile of original sand is 120 kg, and the first pile of original sand is how many kg?

The second reactor has 120 + 55 = 175
175 / (5 / 7) = 245
So the first pile of 245 + 55 = 300