Question

0,6* (4у-18)-0,4*(5-7у)-3*(3-2,3у) при у -2 4 13

Answer 1

0,6(4у-18)-0,4(5-7у)-3*(3-2,3у) = 2,4у-10,8-2+2,8у-9+6,9у = 12,1у-21,8

если у = -2, то 12,1 * (-2) - 21,8 = -24,2 -21,8 = -46
если у = 4, то 12,1 * 4 - 21,8 = 48,4 - 21,8 = 26,6
если у = 13, то 12,1 * 13 - 21,8 = 135,5

Answer 2

To evaluate the expression for different values of "у," let's substitute each value into the given expression and calculate the result:

For у = -2: 0.6 * (4*(-2) - 18) - 0.4 * (5 - 7*(-2)) - 3 * (3 - 2.3*(-2))

Simplifying the expression inside the parentheses: 0.6 * (-8 - 18) - 0.4 * (5 + 14.0) - 3 * (3 + 4.6)

Continuing to simplify: 0.6 * (-26) - 0.4 * (19.0) - 3 * (7.6)

Performing the multiplications: -15.6 - 7.6 - 22.8

Adding and subtracting: -46

For у = 4: 0.6 * (44 - 18) - 0.4 * (5 - 74) - 3 * (3 - 2.3*4)

Simplifying the expression inside the parentheses: 0.6 * (16 - 18) - 0.4 * (5 - 28.0) - 3 * (3 - 9.2)

Continuing to simplify: 0.6 * (-2) - 0.4 * (-23.0) - 3 * (-6.2)

Performing the multiplications: -1.2 + 9.2 + 18.6

Adding and subtracting: 26.6

For у = 13: 0.6 * (413 - 18) - 0.4 * (5 - 713) - 3 * (3 - 2.3*13)

Simplifying the expression inside the parentheses: 0.6 * (52 - 18) - 0.4 * (5 - 91.0) - 3 * (3 - 29.9)

Continuing to simplify: 0.6 * 34 - 0.4 * (-86.0) - 3 * (-26.9)

Performing the multiplications: 20.4 + 34.4 + 80.7

Adding and subtracting: 135.5

Therefore, the values of the expression for у = -2, 4, and 13 are -46, 26.6, and 135.5, respectively.