Question

Oblicz!.

b) 0,25 + 4/5 : (-0,8)

pod kreską_________

-[(-1,5) * 1 1/2 - 1 1/2

d) -100 : {-[2 3/4 - (-0,5) * (-1 1/2)]}

Answer 1

b) 0,25 + 4/5 : (-0,8)
pod kreską_________
-[(-1,5) * 1 1/2 - 1 1/2

= 1/4 + 4/5 : (-8/10)       /      -[(-3/2) * 3/2 - 3/2 = 
= 1/4 + 4/5 * (-10/8)       /      -[-9/4 - 3/2] =
= 1/4 + 1       /      -(-9/4 - 6/4) = 
= 5/4     /     -(-3/4) =
= 5/4    /  3/4 =
= 5/4 * 4/3 =
= 5/3 =
= 1 i 2/3

d)
-100 : {-[2 3/4 - (-0,5) * (-1 1/2)]} = 
= -100 : {-[11/4 + 1/2 * (-3/2)]} = 
= -100 : {-[11/4 +(-3/4)]} = 
= -100 : [-(11/4 - 3/4)] =

= -100 : (-8/4) =
= -100 * (-4/8) =
= -100 * (-0,5) =
= 50