M a sh q l a r

Ko‘phad va birhad ko‘paytmasini toping (274–278):

274. 1) –5(10+m); 2) –(–2+x); 3) (2y–5)(–);

4) (–2m+3n)(–10); 5) 2(3a²–4a+8); 6) (–)(m–n+p);

7) (3a–5b+bc)(–3); 8) (–5)(3x³+7x²–x).

275. 1) (a-b)n; 2) (–5x+4y)2z; 3) –6x(5y–2x); 4) (x²–x+1)x.

276. 1) 7ab(2a+3b); 3) 12p²q(q²p–q²);

2) 5a²b(15b+3); 4) 3xy²(xy–2x³).

277. 1) 17a(5a+6b–3ab); 3) 3x²y(5x+6y+7z);

2) 8ab(2b–3ac+c²); 4) xyz(x²+2y²+3z²).

278. 1) ; 2) ;

3) .

Ifodani soddalashtiring (279–281):

279. 1) 6(2t–3n)–3(3t–2n); 3) –2(3x–2y)–5(2y–3x);

2) 5(a–b)–4(2a–3b); 4) 7(4p+3)–6(5+7p).

280. 1) (x²–1)3x–(x²–2)2x; 3) 2(3a+4)+3(a–7)–7(2a–7);

2) (4a²–3b)2b–(3a²–4b)3b; 4) 3(2x–1)–5(x–3)+6(3x–4).

281. 1) 5(0,8y–0,1)–0,7(4y+1)+8(0,7–0,4y);

2) ;

3) ;

4) 0,2(5y+6)–4(0,25y–1,3)+5(0,1y–1,62).

282. Algebraik ifodaning qiymatini toping:

1) 7(4a+3b)–6(5a+7b), bunda a=2, b= –3;

2) a(2b+1)–b(2a–1), bunda a=10, b= –5;

3) 3ab(4a²–b²)+4ab(b²–3a²), bunda a=10, b= –5;

4) 4a²(5a–3b)–5a²(4a+b), bunda a= –2, b= –3.