1. x - 3.8 при x = 3.8
3.8 - 3.8 = 0
2. -6x при х = -2 и 1\12
2 и 1\12 = 25\12
-6*(-25\12) = 25\6 = 4 и 1\6
3. 12х + 7 при х = - 0.05
12*(-0.05) + 7 = -0.6 + 7 = 6.4
4. 4 - 2.5х при х = -0.5
4 - 2.5(-0.5) = 4 + 1.25 = 5.25
5. (у + 4х)\(х - 2у) при х = 0.5 и у = -2
(-2 + 4*0.5)\(0.5 - 2*(-2)) =
= 0