Question

Б) 2/25x^3y при:x=5,y=-1/4 в)-4xy^2 при:x=0,2,y=-3/4

Answer 1

Ответ:

Пошаговое объяснение:

б) =2\25*5³*(-1\4)=2\25*125*(-1\4)=-5\2=-2 1\2

в)=-4*0.2*(-3\4)²=-4*9\16*0.2=-2.25*0.2=-0.45

Answer 2

To evaluate the given expressions, simply substitute the provided values of x and y into each expression and perform the calculations:

a) 2/25x^3y when x = 5 and y = -1/4:

Substitute x = 5 and y = -1/4 into the expression: 2/25 * 5^3 * (-1/4)

Now, calculate the result: 2/25 * 125 * (-1/4) = 2/25 * (-125/4) = -250/100 = -5/2

So, the value of the expression 2/25x^3y when x = 5 and y = -1/4 is -5/2.

b) -4xy^2 when x = 0.2 and y = -3/4:

Substitute x = 0.2 and y = -3/4 into the expression: -4 * 0.2 * (-3/4)^2

Now, calculate the result: -4 * 0.2 * (9/16) = -4 * (9/80) = -36/80 = -9/20

So, the value of the expression -4xy^2 when x = 0.2, and y = -3/4 is -9/20.