I b o b g a d o i r
m a sh q l a r
Algebraik ifodaning son qiymatini hisoblang (69–75):
69.
1) a+bc, bunda
a=–1, b=3, c=0;
2)
a–bc, bunda a=2, b=–1, c=–3;
3)
(a+b)c, bunda a=1, b=–3, c=2;
4)
(a–b)c, bunda
a=3, b=1,2, c=5.
5)
(a–b)+(c–d), bunda a=4, b=2,
c=3, d=–1;
6)
(a–b)–(c–d), bunda a=0, b=–4, c=–2, d=3;
7)
a– (b–c),
bunda a=0,5,
b=, c=–1,2;
8)
a– (b–c)–d, bunda a=5,2, b=1,3, c=2,8, d=2,8;
70.
1) 5(x–y)2; 2)
3(x+y)2; 3) (5x–y)2; 4)
(3x+y)2. bunda x=2,5, y=4,5.
71.
1) 2((a–b)2+1); 2) 4(3–(a–b)2); 3)
((a–b)a–8):2; 4) (5a–(a+b)):3, bunda a=5, b=–1.
72.
1) 3(a+b)–2ab; 2) 3a+b–2ab; 3) 3(a–b)+2ab; 4) 3a–b+2ab, bunda a=1,2, b=1,8.
73.
1) 
, bunda b=–2, c=–1/3;
2)
–0,75a2+, bunda a=–2, b=3;
3)
(a2–26)2, bunda a=–5; 4) (a3+26)3,
bunda a=–3.
74.
Ifodalarning geometrik ma’nosini oching.
1)
a · b, bunda
a va b – to‘g‘ri
to‘rtburchakning tomonlari;
2)
a2, bunda a
– kvadratning tomoni uzunligi;
3)
2 (a+b), bunda
a va b – to‘g‘ri to‘rtburchakning tomonlari uzunligi;
4)
4a, bunda a – kvadratning
tomoni.
75.
1) a2 – 4x2,
bunda a – katta kvadratning tomoni, x – har bir kichik
kvadratchaning tomoni uzunligi (3-a rasm);
2) (a ·
b) / (ax + ay) bunda a va b katta to‘g‘ri
to‘rtburchakning, x
va y esa kichik to‘g‘ri
to‘rtburchaklarning tomonlari
(3-b rasm).
3-rasm.
76.
Bir gektar ko‘kalamzor
bir yil davomida
havoni 70 t
changdan tozalashga qodir. 10 ga; 100 ga; m gektar ko‘kalamzor bir yilda havoni necha
tonna changdan tozalaydi? Umumiy maydoni 16000 ga bo‘lgan ko‘kalamzor
havoni necha tonna changdan tozalaydi?
77.
Avtomobilning harakat tezligi ikki marta
ortishi bilan uning tormozlanish yo‘lining to‘rt marta ortishi ma’lum.
Harakat tezligi 30 km/soat bo‘lganda,
tormozlanish yo‘lining uzunligi jadvalda berilgan. Tezlik 60 km/soat bo‘lganda, tormozlanish yo‘lining uzunligi qancha bo‘ladi (5-rasm)?:
|
Yengil
mashina uchun |
|
Yuk mashinasi
uchun |
||
|
v
(km/soat) |
t
(m) |
v
(km/soat) |
t
(m) |
|
|
30 |
7,2 |
30 |
9,5 |
|
78.
(Abu
Rayhon Beruniy masalasi). Agar 10 dirham pul ikki oyda
5 dirham foyda keltirgan bo‘lsa, 8 dirham puldan uch oyda
qancha foyda olish mumkin?
