M a sh q l a r

 

 

     Birhadlarni ko’paytiring (230–237):

         

230.       1) (2a)(3b);      2) (3a)(2b);           3) b2(–3b2);           4) (–2a)a2.

 

231.       1) (2p)(–3c2);   2) (–5m2)(–7n);    3) (4a2)(6a3);       4) (–b3)(8b2).

 

232.       1) (0,3a2)(b3);                  3) (0,2p)(–1,3q2);

          2) (–8m3)(0,25n);               4) .

 

233.       1) (3ab)(–2a2b);                 2) (8ab2)(ac2);

          3) (–4x2y)(–7xy2);               4) (6a2b)(bc2).

 

234.       1) (3a2b5c)(6a3bc2);            3) (a2b3­­­x)(a3bx2);

         2) (7a5b2c)(–3ab4c);            4) (–a3­­­xy3)(ax2y).

 

235.       1) ;     3) ;

          3) ;      4) .

 

236.       1) (–m2)(–24n)(4mn);      3) (ay3)(x2y)(0,2a3x);

         2) (–18n)(–  m2)(–5mn);   4) (–13a2bc)(–5ab2c)(–0,4abc3).

 

237.       1) (–a)(3b)(4a2b)(5ab2);     3) (–1,5ab)(bc)(2ac)(24ab);

           2) (5a)(a2­b2)(–2b)(–3a);    4) (1,2a)(–ab)(–5bc)(2c2).

 

Birhadni darajaga ko‘taring (238–241):

 

238.       1) (2a)3;           2) (5b)2;                3) (3b2)4;               4) (2a3)2.

 

239.       1) (–3ab)4;       2) (–4ab)2;            3) (–abc)5;            4) (–2xyz)3.

 

240.       1) (–2a2b)3;     2) (–a2bc)5;           3) (–3x3y)2;           4) (–2 x2y3)4.

 

241.       1) (nm2)3;     2) (n2m2)4;                   3) (–0,1a3b3)3;       4) (0,4a3b2)2.

 

Amallarni bajaring (242–243):

 

242.       1) (–2a)3(–3a);          3) (–0,2bc2)2(20cx2);

          2) (–a)3(2a);                       4) (–0,1ab2c)2(100by2).

 

243.       1) (–1x3y2)(–c2x2)3;        3) (–3bc2)3(2ab2)2;

          2) (2x3y)(xy2)2;             4) (–2a2b)2(–a2b3)3.

 

244.       Birhadni boshqa birhadning kvadrati shaklida yozing:

1) 9a2;             2) 16x4;                 3) 25a2b4;

4) 81x6y2;         5) 36x10y4;             6) 1,21a8b4.

 

245.       Birhadlarni ko‘paytiring va hosil bo‘lgan ifodaning qiymatini toping:

1) a2·3a2b,  bunda a= –2,  b=;

2) mn·10n2,  bunda m=0,8,  n=4;                 

3) 4a·a2b2c,  bunda a=4,  b=,  c=3;

4) 0,7m2n ·100np,  bunda m=0,3,  n= –0,2,  p=4.

 

246.       (Qadimiy masala). Baliqning uchdan bir qismi loyda, to‘rtdan bir qismi suv tagida va uch qarichi suv ustida. Baliqning uzunligi necha qarich?