Page 40 - Bangladesh_classwiz_BOOK2018_rev_Neat

wØZxq w¯Œb n‡Z ‡`Lv hv‡”Q ‡h, = 1.9 wb‡j Zv wKQyUv eo n‡”Q Avi G‡¶‡Î ( ) > ( )| AviI wKQy
Abygv‡bi ci Avgv‡`i Z…Zxq w¯Œb n‡Z ‡`Lv hv‡”Q ‡h = 1.88 A‡bKUv KvQvKvwQ hw`I wKQyUv Kg| wb‡P j¶¨
Ki‡j ‡`Lv hv‡e ‡h (1.88) I (1.88) LyeB wbKUeZ©x hv ‡_‡K aviYv Kiv hvq ‡h = 1.88 Gi Av‡kcv‡k
‡Kv_vI dvskbwUi ‡Q`we›`y i‡q‡Q|

j¶Yxq ‡h, GB gvb¸‡jv cy‡ivcywi mwVK bq (Kvib mgvavbwU AbywgZ)|

(1.88) = 1.88³ − 2 × 1.88 = 2.884672

(1.88) = 1 + 1.88 = 2.88

myZivs ‡jLwP‡Îi ‡Q`we›`y m¤ú‡K© GKwU fvj Abygvb n‡”Q (1.88,2.88).

Í
©
`yBwU dvsk‡bi Zyjbv Kivi PvB‡Z ‡Q` we›`y wbY‡qi AviI GKwU fvj Dcvq n‡jv ‡Kv_vq GKwU Ašidj (wWdv‡iÝ)
Í
dvsk‡bi gvb k~b¨ Zv Lyu‡R ‡ei Kiv| myZivs Ašidj (wWdv‡iÝ) dvskb ( ) Gi gvb ZvwjKv ‡ei Ki‡Z n‡e
‡hLv‡b,
( ) = ( ) − ( ) = ³ − 3 − 1

‡jLwP‡Îi ‡Q`we›`y ‡mwUB ‡hLv‡b AšÍ©dj (wWdv‡iÝ) dvsk‡bi gvb k~b¨| ‡jLwPÎ `ywU ‡Kv_vq ‡Q` Ki‡Z cv‡i ‡m
m¤ú‡K© ¯^í aviYv _vKv m‡Ë¡I GKwU gv‡bi ZvwjKv ‰Zwii Rb¨ fvj cQ›` n‡jv = −14 ‡_‡K ïiæ K‡i

= 15 I GKK e¨eavb| Gi ‡h gv‡bi Rb¨ ( ) k~b¨Zv Lyu‡R ‡ei Kivi Rb¨ ZvwjKvi Dc‡i wb‡P LyuR‡j
m¤¢ve¨ wZbwU e¨ewa cvIqv hv‡e, hv wb‡P ‡`Lv‡bv n‡q‡Q -

hLb wÎNvZ dvskbwUi wPý cwiewZ©Z nq (nq FYvZ¥K n‡Z abvZ¥K w`‡K bZyev wecixZµ‡g) GwU k~b¨ we›`y‡K
AwZµg Ki‡e| myZivs, k~b¨ we›`ywU −2 < < −1, −1 < < 0 Ges 1 < < 2 Gi g‡a¨ _vKvi m¤¢vebv
i‡q‡Q| Avgiv GLv‡b GB wZbwU e¨ewai ïaygvÎ ‡k‡liwUB wbix¶v Kie| evisevi gv‡bi ZvwjKv Gfv‡e ‡QvU Ki‡j
djvd‡ji gvb AviI m~² n‡e| wb‡Pi wZbwU ZvwjKv ‡_‡K gvbwU ‡ei Kivi AbyµgwU fvj K‡i j¶¨ Ki‡j ‡`Lv
hv‡e ‡h, ‡hLv‡b cÖwZwU e¨ewa‡KB `kwU K‡i gvb ‡bqv n‡q‡Q| e¨ewa¸‡jv n‡jv 1 < < 2,1.8 < <

1.9Ges 1.87 < < 1.88.

35