20 баллов решите плиз,уравнение: х-(16 8/21 - 5) = 10 1/3,срочно ребят!. Created by roman00. matematika-ru

3,срочно ребят!...

witch2

Verified answer

х-(16 8/21 - 5) = 10 1/3
x - 11 8/21 = 10 1/3
x = 10 1/3 + 11 8/21
x = (10+11)+(1/3+8/21) = 21 + (3*7+8/21) = 21 15/21 = 21 5/7
_______________________________
проверка
21 5/7 -(16 8/21 - 5) = 10 1/3
21 5/7 - 11 8/21 = 10 1/3
(21-11)+(5/7 - 8/21) = 10 +( 5*3-8/21)= 10 + 7/21 = 10 7/21 = 10 1/3

верно!

5 votes Thanks 4

PhysM $x-\left(\cfrac{344}{21}-5\right)=\cfrac{31}{3}\\x-\cfrac{239}{21}=\cfrac{31}{3}\\x=\cfrac{31}{3}+\cfrac{239}{21}=\cfrac{152}{7}=21\cfrac{5}{7}$
Выполним проверку:
$\cfrac{152}{7}-\cfrac{239}{21}=\cfrac{31}{3}\\\cfrac{31}{3}=\cfrac{31}{3}$
Все выполнено верно

2 votes Thanks 1

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