-1,2(-3х-у)+7,9х-0,7(4у-х), при х=-0,2, у=0,6

To find the value of the expression -1.2(-3x-y) + 7.9x - 0.7(4y-x) when x = -0.2 and y = 0.6, we will substitute these values into the expression:

-1.2(-3(-0.2) - 0.6) + 7.9(-0.2) - 0.7(4(0.6) - (-0.2))

Now let's simplify:

-1.2(0.6 + 0.6) + 7.9(-0.2) - 0.7(2.4 + 0.2) -1.2(1.2) + 7.9(-0.2) - 0.7(2.6) -1.44 - 1.58 - 1.82 -4.84

Therefore, when x = -0.2 and y = 0.6, the value of the expression -1.2(-3x-y) + 7.9x - 0.7(4y-x) is -4.84.