Page 52 - Fixtures

@ @SW@ @óïŽbŽÿa@‡ÉÜa@ú†bjà@ @

( ) 20x + 5y + z = 1000
( ) x + y + z = 100

.19x + 4y = 900

() y = 900 − 19x = 225 − 19 x y
() 44
0 < y < 99

0 < 225 − 19 x < 99
4

−225 < −19 x < 99 − 225
4

−225 < −19 x < −126
4

126 × 4 < x < 4 × 225
19 19

28 x 26.53 < x < 47.36 x

.( ) 4

. 44 40 36 32

. x + y > 100 x = 32 x = 28

z = 10 y = 54 x = 36 ()

z = 25 y = 35 x = 40

z = 40 y = 16 x = 44

.3

27 × 34 × 73