When n is what value, the solution of the equation 2x + N3 + 1 = 1 − x2 + n is 0?

When n is what value, the solution of the equation 2x + N3 + 1 = 1 − x2 + n is 0?

Substituting x = 0 into the equation 2x + N3 + 1 = 1 − x2 + N, we can get: N3 + 1 = 12 + N, removing the denominator, we can get: 2n + 6 = 3 + 6N, ｜ n = 34, that is, when n = 34, the solution of the equation 2x + N3 + 1 = 1 − x2 + n about X is 0

What is the speed of a ship in still water if the speed of the ship upstream is known to be m km / h and the current speed is 2 km / h?

Solution: the velocity in still water is x km / h
X-2=M
X=M+2
A: the speed in still water is (M + 2) km / h
Velocity against water = velocity in still water - velocity of water

Test (18 15:55:36)
The following statement is true
A. If the absolute values of two numbers are equal, the two numbers must be equal;
B. The absolute value of two unequal numbers is also unequal
C. The absolute values of two equal numbers are also equal;
D. If two numbers are opposite to each other, they must not be equal

Choose C
For example, the absolute values of 1 and - 1 are equal and the numbers are not equal
B ditto
C is correct. There are no two absolute values for the same number
D as 0

｛X+2Y=145
｛2X+3Y=280

2X+4Y=290
Left minus left, right minus right
2X+4Y-2X-3Y=290-280
Y=10
X=125