If triangle is a new operation symbol, let x △ y = 2x-y, then what is m in 2 △ M = - 8

If triangle is a new operation symbol, let x △ y = 2x-y, then what is m in 2 △ M = - 8

From the formula you give, 2 × 2-m = - 8, so m = 12

Given that X-Y = 2, xy = 7, find x ^ 2, y-xy ^ 2

It's 14
Because X-Y = 2, so x = y + 2,
So x ^ 2y-xy ^ 2 = XY (X-Y) = 7 × (y + 2-y) = 7 × 2 = 14
Please accept! Thank you

Given x + y = 2, xy = - 15, find the value of (y + 1) / (x + 1) + (x + 1) / (y + 1)

In this paper, we want to get the following result from the following (178; + y \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\;) + 2 (x + y) + 2] / [XY + (x

It is known that the value range of the independent variable of a linear function is 2 ≤ x ≤ 6, and the value range of the function is 5 ≤ y ≤ 9

Let y = KX + B (K ≠ 0) be the relation of the function. The range of independent variable of the function y = KX + B is 2 ≤ x ≤ 6, and the range of corresponding function value is 5 ≤ y ≤ 9. Then, when k > 0 is an increasing function, that is, when x = 2, y = 5, x = 6, y = 9

The addition of rational numbers in the first math problem of junior high school
1,(-15)+(-4)+(-9)+20=
(-3.7)+(-2.4)+8.2+0.7

1,(-15)+(-4)+(-9)+20= -（15+4+9）+20=-28+20=-8
30+(-18)+(-16)+5 = 30-（18+16）+5=30-34+5=1

Granny Liu's family has 42 chickens, accounting for 6 / 25 of the total number of chickens, ducks and geese, and the number of ducks accounts for 2 / 5 of the total number of chickens, ducks and geese?

Chicken, duck and goose = 42 △ 6 / 25 = 175
Ducks = 175 × 2 / 5 = 70

The minimum value of the function y = xsquare-2x-3 is

Y = xsquare-2x-3
=(x-1)²-4≥-4
The minimum value of the function y = x squared - 2x - 3 is - 4

I really need the answer to the eighth question in the first volume exercise book of junior high school mathematics,
8. If x + 2 and Y-3 are opposite to each other, find the value of X + y

When / x + 2 / > 0, then / Y-3/

How to solve 0, 1 / 2, 8 / 11, 5 / 6, 8 / 9, ()
How to solve this problem?

a 0 1/2 8/11 5/6 8/9
1-a 1 1/2 3/11 1/6 1/9
3/3 3/6 3/11 3/18 3/27 （3/38)
Denominator difference 3 5 7 9 (11)
1-3/38=35/38
It's a little complicated. I don't know if there's a simple way

How many meters is a nanometer

One nanometer is 10-9 meters