Question

Tutaj musicie zamienić albo ułamki zwykłe na dzisiętne albo dziesiętna na zwykłe tylko tak zeby wynik był dobry ! :)

a) (1 - 5/7) x o,49=

b) 1 3/8 - (0,9 - 3/4 ) =

c)2,4 x 1/3 + 4,8 : 2 2/5 =

d) (1/2 + 0,4) x (3/4 - 0,2)=

e) 4-(2,5 - 1 1/5) x 9/13 =

f) 1/4 x 5,6 + 2,7 : 1 1/5 =

g) (4,8 : 5 1/3 ) x (2 1/6 x 0,6) =

h) (0,5 +1/3) x 2=

Answer 1

a)

(1 - 5/7) x o,49=2/7*49/100=98/700=7/50 (skrócone przez 14)

b)

1 3/8 - (0,9 - 3/4 ) =1,375-(0,9-0,75)= 1,375- 0,15=1,225

c)

2,4 x 1/3 + 4,8 : 2 2/5 =24/10*1/3+4,8:2,4=24/30+2=4/5+2=0,8+2=2,8

d)

(1/2 + 0,4) x (3/4 - 0,2)=(0,5+0,4)*(0,75-0,2)= 0,9*0,55=0,495

e)

4-(2,5 - 1 1/5) x 9/13 = 4- (2,5-1,2)*9/13= 4-1,3*9/13=4-13/10*9/13= 4- 117/130=

3 13/130= 3 1/10 = 3,1

f)

1/4 x 5,6 + 2,7 : 1 1/5 =0,25 *5,6+2,7:1,2=1,4+2,25=3,65

g)

(4,8 : 5 1/3 ) x (2 1/6 x 0,6) =(48/10:16/3)*(13/6*6/10)=48/10*3/16)*(13/6*6/10)=

9/10*13/10=117/10=11,7

h)

(0,5 +1/3) x 2=(5/10+1/3)*2=( 15/30+10/30)*2=25/30*2= 5/6*2=10/6=1 4/6=1 2/3

 

Answer 2

a) (1 - 5/7) x 0,49 = (7/7 - 5/7) x 49/100 = 2/7 x 49/100 = 7/50 = 14/100 = 0,14

b) 1 3/8 - (0,9 - 3/4) = 11/8 - (0,90 - 0,75) = 11/8 - 0,15 = 11/8 - 15/100 = 11/8 - 3/20 = =110/80 - 12/80 = 98/80 = 1 18/80 = 1 9/40

c) 2,4 x 1/3 + 4,8 : 2 2/5 = 1 4/10 x 1/3 + 4 8/10 : 2 2/5 = 24/10 x 1/3 + 48/10 : 12/5 =

=12/5 x 1/3 + 24/5 : 12/5 = 4/5 + 24/5 : 5/12 = 4/5 + 2 = 2 4/5 = 2 8/10 = 2,8

d) (1/2 + 0,4) x (3/4 - 0,2) = (1/2 + 4/10) x (3/4 - 2/10) = (5/10 + 4/10) x (15/20 - 4/20) =

=1/10 x 11/20 = 11/200

e) 4 - (2.5 - 1 1/5) x 9/13 = 4 - (2 5/10 - 1 1/5) x 9/13 = 4 - (2 5/10 - 1 2/10) x 9/13 =

= 4 - 1 3/10 x 9/13 = 4 - 13/10 x 9/13 = 4 - 9/10 = 40/10 - 9/10 = 31/10 = 3 1/10 = 3,1

f) 1/4 x 5,6 + 2,7 : 1 1/5 = 0,25 x 5,6 + 2 7/10 : 1 1/5 = 1,4 + 27/10 : 6/5 = 1,4 + 27/12 =

=1 4/10 + 2 3/12 = 1 4/10 + 2 1/4 = 1 8/20 + 2 5/20 = 3 13/20 = 3,65

g) (4,8 : 5 1/3) x (2 1/6 x 0,6) = (4 8/10 : 5 1/3) x (2 1/6 x 6/10) =

=(16/5 : 8/1) x (13/6 x 6/10) = (16/5 x 1/8) x 13/10 = 2/5 x 13/5 = 13/25 = 0,52

h) (0,5 + 1/3) x 2 = (5/10 + 1/3) x 2 = (1/2 + 1/3) x 2 = (3/6 + 2/6) x 2 = 5/6 x 2 =

=10/6 = 1 4/6 = 1 2/3

 

pomoglam?? daj naaaj ;)