M a sh q l a r

   

   (1) formuladan foydalanib, ko‘paytirishni bajaring (386–394):

   

386.                 1) (c+d)(c–d);                3) (a+c)(c–a);       5) (a–b)(–a–b);

                2) (p+q)(p–q);             4) (m–n)(m+n);    6) (2–m)(–2–m).

 

387.                 1) (x+5)(x–5);                3) (a–4)(4+a);       5) (1+a)(1–a);

               2) (a+3)(a–3);              4) (7+x)(x–7);       6) (b–1)(1+b).

 

388.                 1) (2b+a)(2b–a);       2) (y+6x)(6x–y);

               3) (c+3d)(c–3d);       4) (3m–2n)(2n+3m).

 

389.                 1) (4d–)(+4d);                   3) ;

               2) ;                  4) .

 

390.                 1) (c2+d2)(c2–d2);                      3) (x4–y3)(y3+x4);

               2) (a2+b3)(a2–b3);                     4) (m3–n3)(m3+n3).

 

391.                 1) (3a2+4b3)(3a2–4b3);             3) (0,2t3+0,5p4)(0,5p4–0,2t3);

                2) (2m4–5n2)(5n2+2m4);         4) (1,2a2–0,3b2)(1,2a2+0,3b2).

 

392.                 1) ;

               2) ;

              3) ;

             4) .

 

393.           1) (3x2y–4xy2)(3x2y+4xy2):    3) (7ab+x2y3)(7ab–x2y3).

                  2) (5ab2+2a2b)(5ab2–2a2b); 4) (3a–2b)(3a+2b)(9a2+4b2).

 

394.                 1) (3+x)(3–x)(9+x2);                          3) (4x2+y2)(2x+y)(2x–y);

               2) (x2+1)(x+1)(x–1);                         4) (3a–2b)(3a+2b)(9a2+4b2).

 

Qisqa ko‘paytirish formulalaridan foydalanib hisoblang (395–396):

 

395.                 1) 48·52;               2) 68·72;               3) 43·37;               4) 47·53.

 

396.                 1) 47·33;               2) 44·36;               3) 84·76;               4) 201·199.

 

397.                 Soddalashtiring:

1) (c–3)2–(c+3)(3–c);          4) (3a–4b)(3a+4b)– (3a–4b)2;

2) (a+2)2–(a+2)(2–a);                  5) (–b–a)(a+b)+a2+b2;

3) (2x+3y)(2x–3y)+(2x+3y)2;         6) (b–a)(–a–b)+2b2.

 

398.                 Ifodaning qiymatini toping:

1) 4m–(m+3)2+(m–3)(m+3),  bunda m= –2,4;

2) (3x+4)2–10x–(x–4)(4+x),  bunda x= –0,1;

3) 2(k–7)(k+5)–(k–5)2–(k–7)(7+k),  bunda k= –;

4) (a+3)2+(a–3)(3+a)–2(a+2)(a–4),  bunda a= –.

 

399.                 Tenglamani yeching:

1) (2x+3)2–4(x–1)(x+1)=49;

2) (3x+4)2–(3x–1)(1+3x)=49;

3) (3x+2)(3x–2)–(3x–4)2=28;

4) (3x+1)2–(3x–2)(2+3x)=17.

 

400.                 Kvadratning ikki qarama-qarshi tomonining har biri 8 sm ga uzaytirildi, qolgan ikki tomoni esa shuncha qisqartirildi. Shaklning yuzi qanday o‘zgaradi?

 

 

 


401.                 Hisoblang:  .