How to solve this equation: (x + 240) × 75% - x = 180

How to solve this equation: (x + 240) × 75% - x = 180

(x+240)×75%-x=180
That is to say, (?) 190; (x + 240) - x = 180
3(x+240)-4x=720
3x+720-4x=720
-x=0
x=0

1.25 of 1.4 = 0.75 of X

1.25 of 1.4 = 0.75 of X
1.25x=1.4*0.75
x=0.84

Solution of the equation: three eighths of a number is one fourth more than 25% of the number. Find the number,

Let this number be x, then its 3 / 8 is (3 / 8) X
His 25% is 25% * X
So (3 / 8) x-25 ^ * x = 1 / 4
0.375x-0.25x=0.25
0.125x=0.25
x=0.25÷0.125
x=2
So the number is two

The partial derivatives of Z = arctan (Y / x) x, y

x,-y*x^(-2)/(1+(y/x)^2)
y,1/(x(1+(y/x)^2))

Can the polynomial of 5 (x-2y) square + [- 6 (x-2y) cube] simplify and merge similar terms?

The beauty of Mathematics
5(x-2y)² + [ - 6(x-2y)³ ]
= 5(x-2y)² - 6(x-2y)³
= (x-2y)² [ 5 - 6(x-2y) ]
= (x-2y)² ( 5 - 6x +12y )

1 * 3 + 2 * 4 = 1 () 3 () 2 () 4 requirements: the sign filled in is different from that on the left side of the sign

1+3*2+4

Given that y is proportional to 3x + 4, and x = 2, y = 5 (1), find the functional relation between Y and X, and point out what function it is
(2) If point (a, 2) is on the image of this function, find the value of A

Y=(3x+4)k
10k=5
k=1/2
Y=(3x+4)/2
It's a linear function
3a+4=4
a=0

A cylindrical reservoir with a bottom radius of 10 meters can store 1570 cubic meters of water. If the depth of excavation is 2.5 meters, how many cubic meters can the reservoir store?

3.14 × 102 × 2.5 + 1570, = 314 × 2.5 + 1570, = 785 + 1570, = 2355 (M3); a: this storage capacity can store 2355 m3

2 5 6 10 is 24 o'clock
Pay attention to the order

Finding the extremum of function f (x) = 2x ^ 3 + 3x ^ 2-12x + 5

If y = 2x ^ 3 + 3x ^ 2-12x + 5 is derived,
y '=6x^2 +6x -12,
Let y '= 0, x = 1 or - 2,
Then, we get y "= 12x + 6,
So when x = 1, y '= 0, Y "= 12 + 6 = 18 > 0, satisfy the condition that y is the minimum,
So when x = 1, y = - 2 is the minimum
When x = - 2, y '= 0, Y "= - 24 + 6 = - 18