Given a + B = 1, ab = - 3, find the square of (a-b), Given a + B = 2 / 3, ab = 2, find the cubic power of a, the square of B + 2a, the square of B + the cubic power of ab

Given a + B = 1, ab = - 3, find the square of (a-b), Given a + B = 2 / 3, ab = 2, find the cubic power of a, the square of B + 2a, the square of B + the cubic power of ab

a+b=1,ab=-3,
(a+b)^2=1
a^2+b^2=1+6=7
The square of (a-b)
=a^2+b^2-2ab
=7+6
=13

On the equation x & sup2; + MX + n = 0 of X, one root is - 1, find the value of the algebraic formula M-N? If M + N + 1 = 0, can you find a heel of the equation x & sup2; + MX + n = 0 through observation?

Because one root of the equation x & sup2; + MX + n = 0 is - 1, substituting - 1 into the equation to get: 1-m + n = 0, then 1 - (m-n) = 0 is transferred to get: M-N = 1, and because m + N + 1 = 0, the system of equations is composed of M-N = 1 ① m + n = - 1 ②; solving the system of equations gets M = 0, n = - 1; bringing the value of M, n into X & sup2; + MX + n = 0 gets: X1 = - 1, X2 = 1, so the other root of the equation x & sup2; + MX + n = 0 is 1

Come on! Second grade math problem
1. If the arithmetic square root of a + 8 + (B-27) ^ 2 = 0, find the cube root of a - the cube root of B. 2. It is known that the square root of X + 2 is plus or minus 2, the cube root of 2x + y + 7 is 3, find the cube root of X + y
3. If the cube root of a is meaningful, what is the value range of a?

So only when a + 8 = 0 and B-27 = 0, the arithmetic square root of a + 8 + (B-27) ^ 2 = 0, we can get: a = - 8, B = 27, the cube root of A-B = (- 8), the cube root of - 27 = (- 5) 2, the square root of X + 2 is positive or negative 2, we can get: x + 2 = 4

Given that the equation cos ^ 2x-sin ^ 2x + 2sinx + 2a-3 = 0 has exactly two real roots in [0,2 π], the value range of a is obtained

cos^2x-sin^2x+2sinx+2a-3=0
1-sin^2x-sin^2x+2sinx+2a-3=0
1-2sin^2x+2sinx+2a-3=0
2sin^2x-2sinx-2a+2=0
Think of SiNx as a whole
Δ=4+8（2a-2）
=16a-12＞0
a＞12/16
That is, a > 3 / 4

Five eighths of a number is 120, and three fourths of a number is 120

Let this number be X
x×5/8=120
x=192
Three fourths of this number is
192×3/4=144

In the reaction 2x + y  2Z, the relative molecular mass of X is ()
A. 24B. 48C. 64D. 128

Suppose that the relative molecular mass of X is a2x + y  2z2a 32 & nbsp; & nbsp; & nbsp; 2 × 80, then according to the sum of the masses before and after the reaction is equal, we can know that 2A + 32 = 2 × 80, the solution is a = 64, so we choose C

To process a batch of machine parts, it takes 10 hours for the master to process alone, and 15 hours for the apprentice to process alone

6 hours

2x square-8x = 7 solution equation

2x-8x = the square of 7
-6x=14
X = 14 divided by 6
X = 7 / 3

The co-existence quantity of a and B warehouses is 200 tons. After 40 tons each, the ratio of grain quality left in a and B warehouses is 7:5
solve equations

Grain in stock: (200-40 × 2) / (7 + 5) × 7 = 70 (T)
Original grain in stock: 70 + 40 = 110 (tons)
Original B grain stock: 200-110 = 90 (tons)

To solve the equation: 3.8 × 3-0.7x = 9.3 x =? Please list the details,

3.8×3-0.7X=9.3
11.4-9.3=0.7X
0.7X=2.1
X=3