Question

3/4(2y-4/9)-0,5(4+y)+2(-y+3,8),якщо y=-3,2;2 1/5

Answer 1

Ответ:

Пошаговое объяснение:

=3/2у-1/3-2-1/2у-2у+7 3/5=у-5/15-2+

7 9/15=у+5 4/15

-3,2+5 4/15=-3 1/5+5 4/15=-3 3/15+5 4/15=

2 1/15

2 1/5+5 4/15=2 3/15+5 4/15=7 7/15

Answer 2

To evaluate the expression for different values of y, we'll substitute the given values into the expression and perform the calculations.

1. For y = -3.2: 3/4(2y - 4/9) - 0.5(4 + y) + 2(-y + 3.8) = 3/4(2(-3.2) - 4/9) - 0.5(4 + (-3.2)) + 2(-(-3.2) + 3.8) = 3/4(-6.4 - 4/9) - 0.5(0.8) + 2(6.2) = 3/4(-6.4 - 4/9) - 0.4 + 12.4 = 3/4(-6.58666666667) - 0.4 + 12.4 = -4.939999999988 - 0.4 + 12.4 = 6.06

So, when y = -3.2, the value of the expression is approximately 6.06.

2. For y = 2 1/5: 3/4(2y - 4/9) - 0.5(4 + y) + 2(-y + 3.8) = 3/4[2(2 1/5) - 4/9] - 0.5[4 + (2 1/5)] + 2[-(2 1/5) + 3.8] = 3/4[2(11/5) - 4/9] - 0.5[4 + 11/5] + 2[-11/5 + 3.8] = 3/4[(22/5) - 4/9] - 0.5[(20/5) + 11/5] + 2[7/5] = 3/4[(22/5) - 4/9] - 0.5[31/5] + 14/5 = 3/4[(198/45) - 4/9] - 31/10 + 14/5 = 3/4[(198 - 20)/45] - 31/10 + 14/5 = 3/4(178/45) - 31/10 + 14/5 = 3/4(178/45) - 31/10 + 28/10 = (3/4)(178/45) - 3/10 = 534/180 - 3/10 = (534 - 54)/180 = 480/180 = 8/3 ≈ 2.66666666667

So, when y = 2 1/5, the value of the expression is approximately 2.67.