Question

G,l,n dau inima!! PLS

Answer 1

g)
(2+3/8:1/2)×20=
=(2/1+3/8×2/1)×20/1=
=(2/1+ 3×1 totul supra/4×1)×20/1=
=(2/1+3/4)×20/1=
=4×2+3 tot asta supra/4 × 20/1=
=8+3 totul supra/4 × 20/1=
=11/4×20/1=
=11×5 totul supra/1×1=
=55/1=
=55

i)
(2+2/5)×(1/2+1/3):4=
=(2/1+2/5)× 3×1+2×1 tot asta supra/6 : 4/1=
=5×2+2 tot asta supra/5 × 5/6 ×1/4=
=12/5×5/6×1/4=
=2×1 totul supra/1×1 × 1/4=
=2/1 ×1/4=
=1×1 totul supra/1×2=
=1/2

l) scuze am crezut ca e i

(1/2+3/5)×30/22+1/2:(2/5-1/10)=
=5×1+2×3 tot asta supra/10 ×30/22 +1/2: 2×2-1 tot asta supra/10=
=5+6 totul supra/10×30/22 +1/2:3/10=
=11/10×30/22 + 1/2×10/3=
=1×3 totul supra/1×2 + 1×5 totul supra/1×3=
=3/2 + 5/3 =
=3×3+2×5 tot asta supra/6=
=9+10 totul supra/6=
=19/6

n)
[1/10+2/5 ×(2/3-1/4)]:2 întregi 1/2=
=(1/10+2/5× 4×2-3×1 tot ăsta supra/12): 2×2+1 tot asta supra/2=
=(1/10+2/5× 8-3 totul supra/12): 5/2=
=(1/10 + 2/5× 5/12)×2/5=
=(1/10 + 1×1 totul supra/1×6)×2/5=
=(1/10+ 1/6)×2/5=
=3×1+5×1 tot asta supra/30 × 2/5=
=3+5 totul supra/30 × 2/5=
=8/30 × 2/5=
=8×1 totul supra/15×5=
=8/75

Answer 2

g)  ( 2 + 3/8 : 1/2 ) × 20 = ( 2 + 3/8 × 2/1 ) × 20 = ( 2 + 3/4) × 20 =

= ( 8/4 + 3/4) × 20 =(11/4 ) × 20 =  11 × 5 = 55 



l)  ( 1/2 + 3/5 ) × 30/22 + 1/2 : ( 2/5 - 1/10 ) = 

= ( 5/10 + 6/10 ) × 30/22 + 1/2 : ( 4/10 - 1/10) =

= 11/10 × 30/22 + 1/2 : 3/10 = 

= 3/2 + 1/2 × 10/3 = 

= 3/2 + 5/3 = 9/6 + 10/6 = 19/6 = 3 intregi si 1/6 

n) [ 1/10 + 2/5 × ( 2/3 - 1/4 ) ] : ( 2 × 2 + 1 ) / 2 = 

= [ 1/10 + 2/5 × ( 8/12 - 3/12 ) ] : 5/2 = 

= ( 1/10 + 2/5 × 5/12 ) ×  2/5 = 

= ( 1/10 + 1/6 ) × 2/5 = 

= ( 3/30 + 5/30 ) × 2/5 = 

= 8/30 × 2/5 = 8/( 15×5) = 8/75