Question

Oblicz wartość wyrażenia dla a = 2 , b= -1 , c = 1/4.
a) a + b +c =
b)a(8c - b) =
c)2(a + b )(a - b)c =
d) 1/4(ab + bc + ac) =
e) 4c + b + 10a + 15 / 5 =
f)(a - 2b)( 1 : c) / 8 =

Answer 1

a) 2-1 + \frac{1}{4} = 1 \frac{1}{4}

b) 2x(2 + 1)= 2x3 = 6

c) 2(2-1)(2 - \frac{1}{4}) = 2 x 1/4 = 1/2

d) 1/4(ab + bc + ac) =  1/4 x [(-2) - 1/4 + 1/2] = 1/4 x (-2) = -1/2

e) 4c + b +10a + 15/5 = 1 - 1 + 20 + 3 = 23

f) (2+2)(4) / 8 = 16 / 8 = 2