Question

(5 3/8 +18 1/2 -c) :8 1/2 =2 ;(3 1/2 - 2 2/3+b +4 3/5) * 24 =270 2/5

Answer 1

(5 3//8+18 1//2-c):8 1//2=2
(5.375+37//2-c):(8 1//2)-2=0
(23.875-c):(17//2)-2=0
23.875/8.5-c/8.5-2=0
(55//68)-c/8.5=0

c=55//68*8.5
c=6.875

 

(3 1//2-2 2//3+b+4 3//5)*24=270 2//5
(3.5-8//3+b+4 3//5)*24-270 2//5=0
(5//6+b+4.6)*24-270 2//5=0
130.4+24b-1352//5=0
-140+24b=0

b=140/24

b=35//6

b=5 5//6

// - черта дроби 

Answer 2

(5 3/8 +18 1/2 -c) :8 1/2 =2

23,875-с=2*8 1/2

23,875-с=17

-с=17-23,875

-с=-6,875

с=6,875

 

(3 1/2 - 2 2/3+b +4 3/5) * 24 =270 2/5

84-64+24b+110,4=270,4

130,4+24b=270,4

24b=270,4-130,4

24b=140

b=140/24

b=5 5/6