Question

Dau coroana,
De rezolvat aceste 4 exercitii.

Answer 1

a) 10 5/9 -1 7/32 ×( 4 14/15 + 3 1/15)=
= 95/9 -39/32 ×( 74/15 + 46/15)=
= 95/9 -39/32 ×120/15=
= 95/9 -39/32 ×8=
= 95/9 -39/4=
=(95*4-39*9)/36=
=(380-351)/36=
=29/36


b) 1/13× (2 3/8- 1 5/6) × 2 2/5 +9/10=
= 1/13× (19/8- 11/6) × 12/5 +9/10=
= 1/13× (19*3-11*4)/24 × 12/5 +9/10=
= 1/13× (57-44)/2 × 1/5 +9/10=
= 1/13× 13/10 +9/10=
=1/10+9/10=10/10=1


c) (5 8/15- 4 7/10) × 2 2/3 -5/9 =
= (83/15- 47/10) × 8/3 -5/9 =
= (166-141)/30× 8/3 -5/9 =
= 25/30× 8/3 -5/9 =
= 5/6× 8/3 -5/9 =
=20/9-5/9=15/9=5/3

d) ( 5/24 +5/16) × (1 2/3 - 3/5)× 1 4/5=
=( 5*2+5*3)/48 × (5/3 - 3/5)× 9/5=
=25/48 × (25-9)/15× 9/5=
=25/48 × 16/15× 9/5=
=1/3 × 1/3× 9/1=
=1