Question

a) [(-0,5)* 4/5 -(-0,8) * 10/12 ] : [1-(1 - 2/3 )*(2/3 - 1)]=

b)-2,1 + (- 4/3)*9 : 0,1 + 2.125=

Proszę pomożcie. ;((

Answer 1

a)
[(-0,5)* 4/5 -(-0,8) * 10/12 ] : [1-(1 - 2/3 )*(2/3 - 1)] =
=[(-5/10) * 4/5 -(-8/10) * 10/12)] : [1 - (3/3 - 2/3) * (2/3 - 3/3)] =
= [-2/5 -(-2/3)] : [1 - (1/3 * (-1/3)] =
= (-2/5 + 2/3) : [(1 -(-1/9)] =
= (-6/15 + 10/15) : (1 + 1/9) =
= 4/15 : 1 1/9 =
= 4/15 : 10/9 =
= 4/15 * 9/10 =
= 6/25 

b)
-2,1 + (- 4/3)*9 : 0,1 + 2.125 =
= -2,1 + (-12) : 0,1 + 2,125 = 
= -2,1 + (-120) + 2,125 = 
= -2,1 - 120 + 2,125 = 
= -122,1 + 2,125 = 
= -119,975