Question

A) 2/5 - (1,3 x 4/13 - 0,8) =

b) (-2/3 x 1 1/8 + 2/9 x 3/8) : 1/8=

c) 5/6 - (0,6 : 3/8 - 1,6)=

d) 14: 2 2/9 - 8,4 x 1 2/7=

e) 5 x (0,4 - 2/5 : (-2))=

f) 1 2/7 x (-1,4) - 5,4 x (-1/18) + (2 1/2)² x √2 1/4 x (0,4)²

80% wartości wyrażnia:
9,25 - (5,75 - 5/8((-0,25) x (-4,25) - 0,84))

Answer 1

A)
2/5 - [1,3*(4/13)- 0,8 ] = 0,4 - [ (13/10)*(4/13) - 0,8 ) =
= 0,4 -( 0,4 - 0,8) = 0,4 - (-0,4) = 0,4 + 0,4 = 0,8
b)
[(-2/3)* (9/8) + (2/9)*(3/8) ] : (1/8) =
= [ ( - 18/24) + (6/72)] : (1/8) =
= [(-18/24) + (2/24)] * 8 = (-16/24)*8 = -2/24 = - 1/12
c)
(5/6) - [ (0,6) :(3/8) - 1,6 ] = (5/6) - [ (6/10)*(8/3) - (16/10)] =
= (5/6) - [(16/10) -(16/10)] = (5/6) - 0 = 5/6
d)
14 : (20/9) - 8,4 *(9/7) = 14*(9/20) - (84/10)*(9/7) =
= (63/10) - (108/10) = - (45/10) = -4,5
e)
5*[0,4 - (2/5): (-2)] = 5*[0,4 + 0,2] = 5*0,6 = 3
f)
( 9/7)*(-1,4) - 5,4*(-1/18)+ (5/2)² *√(9/4)*0,4² =
= (9/7)*(-14/10) +(54/10)*(1/18) + (25/4)*(3/2)*0,16 =
= (-18/10) + (54/180) + (3/2) =
= (-18/10) + (3/10) + ( 15/10) = 0
g)
9,25 - [5,75 -(5/8)((-0,25)*(-4,25) - 0,84) ] =
= 9,25 - [5,75 -(5/8)(1,0625 - 0,84)] =
= 9,25 - [ 5,75 - (0,625)*0,2225 ] =
= 9,25 - [ 5,75 - 0,1390625] =
= 9,25 - 5,6109375 = 3,6390625
80 % = 0,8
0,8*3,6390625 = 2,91125
==================================================

Answer 2

A) 2/5 - (1,3 x 4/13 - 0,8) =
=2/5-(13/10*4/13-0,8)=
=2/5-(2/5-0,8)=
=0,4-(0,4-0,8)=
=0,4-(-0,4)=
=0,4+0,4=
0,8

b) (-2/3 x 1 1/8 + 2/9 x 3/8) : 1/8=
=(-2/3*9/8+1/12):1/8=
=(-3/4+1/12):1/8=
=(-9/12+1/12):1/8=
=-8/12*8=
=-5 i 1/3

c) 5/6 - (0,6 : 3/8 - 1,6)=
=5/6-(3/5*8/3-1.6)=
=5/6-(1,6-1,6)=
=5/6

d) 14: 2 2/9 - 8,4 x 1 2/7=
=14*9/20-42/5*9/7=
=36/5-36/5=
=0

e) 5 x (0,4 - 2/5 : (-2))=
=5*(0,4-0,4:(-2))=
=5*(0,4+0,2)=
=5*0,6=
=3

f) 1 2/7 x (-1,4) - 5,4 x (-1/18) + (2 1/2)² x √2 1/4 x (0,4)²=
=9/7*(-7/5)-27/5*(-1/18)+(5/2)²*√9/4*0,16=
=-9/5+3/5+25/4*3/2*0,16=
=-6/5+75/8*16/100=
=-6/5+6/4=
=-1,2+1,5=
=0,3

80% wartości wyrażnia:
9,25 - (5,75 - 5/8((-0,25) x (-4,25) - 0,84))=
= 9,25 - (5,75 -5/8*(1,0625 - 0,84)] =
= 9,25 - (5,75 - 0,625*0,2225) =
= 9,25 - (5,75 - 0,1390625) =
= 9,25 - 5,6109375 = 3,6390625

0,8*3,6390625 = 2,91125

Answer 3

W załączniku. Liczę na naj.