M a sh q l a r

 

         

330.     Sonlarni tub ko‘paytuvchilarga ajrating:   70,  121,  240,  168,  225.

 

331.     Kasrlarni qisqartiring:   ; ; ; .

 

332.     Ko‘paytirishning taqsimot qonunini qo‘llang va hisoblang:

         1) 81·17–15·81;                   3) 15·17+15·67;

         2) 24·2,78+41·2,78;             4) 14·1–4·1.

 

333.     Ko‘paytmani ko‘phad shaklida yozing:

1) (a+2)(a+3);                    3) 3c3(2c2–5);

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

 

334.     A bekatdan B bekatga tomon motorli qayiq 20 km/soat tezlik bilan jo‘nadi. Oradan ikki soat o‘tgandan keyin A dan B ga tomon ikkinchi motorli qayiq 24 km/soat tezlik bilan yo‘lga chiqdi. Ikkala qayiq ham B ga bir vaqtda yetib keldi. A dan B gacha bo‘lgan masofani toping.

 

335.     1) 36 + 34 ifodaning 30 ga; 90 ga;

2) 78 + 76 ifodaning 49 ga; 350 ga;

3) 118 - 116 ifodaning 24 ga; 60 ga karrali ekanini isbotlang.

 

Umumiy ko‘paytuvchini qavsdan tashqariga chiqaring (336–344):

 

336.     1) 2m+2n;        2) 3a–3x;              3) 8–4x;       4) 6a+12.

 

337.     1) 9a+12b+3;            3) –10x+15y–5z;

           2) 8a–4b–2;             4) 9x–3y+12z.      

 

338.     1) ax–ay;          2) cd+bc;             3) xy+2x;              4) 3x–xy.

 

339.     1) 9mn+9n;      2) 3bd–3ab;                   3) 11z–33yz;          4) 6pk–3p.

 

340.     1) ab–ac+a2;             3) 6a2–3a+12ba;

          2) xy–x2+xz;              4) 4b2+8ab–12a2 b.

 

341.     1) a4+2a2;        2) a4–3a3;             3) a4b2+ab3;                   4) x2y3–x3y2.

 

342.     1) 18y7+12y4;             2) 6x4–24x2;          3) 15x5–5x3;          4) 6a5+3a2.

 

343.     1) 9a2b2–12ab3;                   3) 7a2bc+14ab2c;

           2) 20x3y2+4x2y;                  4) 9xyz2–12xy2z.

 

344.     1) 6y5+12y4–3y3;                  3) 4a2b2+36a2b3+6ab4;

          2) 20a4–5a3+15a5;              4) 2x2y4–2x4y2+6x3y3.

 

345.     Hisoblang:

1) 1372+137·63;                  3) 0,73+0,7·9,51;

2) 1872–187·87;                  4) 0,93–0,81·2,9.

 

Ko‘paytuvchilarga ajrating (346–349):

 

346.     1) a(m+n)+b(m+n);             3) a(b–5)–(b–5);

           2) b(a+5)–c(a+5);             4) (y–3)+b(y–3).

 

347.     1) 2a(a–b)+3b(a–b);           3) 5a(x+y)–4b(x+y);

           2) 3n(m–3)+5m(m–3);                 4) 7a(c–d)–2b(c–d).

 

348.     1) a2(x–y)+b2(x–y);              3) a(x2+y2)–b(x2+y2);

           2) a2(x+y)–b2(x+y);           4) x(a2–2b2)+y(a2–2b2).

 

349.     1) 2b(x–1)–3a(x–1)+c(x–1);

          2) c(p–q)–a(p–q)+d(p–q);

          3) x(a2+b2)+y(a2+b2)–z(a2+b2);

          4) m(x2+1)–n(x2+1)–l(x2+1).

 

 

Ko‘paytuvchilarga ajrating (350-352):

 

350.     1) c(a–b)+b(b–a);               3) (x–y)+b(y–x);

          2) a(b–c)–c(c–b);               4) 2b(x–y)–(y–x).

 

351.     1) 7(y–3)–a(3–y);                3) b2(a–1)–c(1–a);

          2) 6(a–2)+a(2–a);              4) a2(m–2)+b(2–m).

 

352.     1) a(b–c)+b2(b–c)–7(c–b);  3) x(a–2)+y(2–a)+ (2–a);

           2) x(x–y)+y(y–x)–3(x–y);             4) a(b–3)+(3–b)–b(3–b).

 

 

353.     Tenglamani yeching:

1) 8–(x–3)(x+3)=10–(x–1)2;                            3) ;

2) (2x+1)2–(2x–3)2=4(7x–5);                  4) .

 

354.     It tulkining orqasidan quvdi. It sekundiga 8 m, tulki esa 6 m tezlik bilan chopdi. Ularning orasidagi masofa dastlab 360 m bo‘lgan, tulkining o‘z uyasiga yetib olishi uchun 1 km qolgan edi. Tulki o‘z uyasiga chopib borishga ulguradimi?