Matematikadan

X -4 V (-4) v .
( ? ) ( ? )
( ч 0 ? )
X ( - l l ) J A - 7 ) x (- 7) X
Q + jCD ( ? ) _ ( ? )
( ? )
Bajarilgan hisoblashlarga mos sonli ifoda tuzing.
489. Qavs oldiga: a) ≪+≫ ishorasi; b) ≪ - ≫ ishorasi
qo‘yib,keyingi ikkita qo‘shiluvchini qavsga
oling.
1) - 718 + 318 - 943 - 712; I 5) - a + b - c - d ;
146
2) 635 - 701 + 438 - 679;
3) -156 - 346 - 725 + 324;
4) 980-305-178 + 412;
6 ) а - b + с - d;
7) —a —b —c + d;
8 ) a — b — c + d.
Koeffxtsiyent.
0 ‘xshash hadlarni ixchamlash
490. 1) Ko‘paytuvchilari bir nechta son va harflardan
iborat ifodani qanday soddalashtirish
mumkin? Misollar keltiring.
2) Ifodaning koeffitsiyenti ( - 1) bolsa, ifoda
oldiga qanday ishora qo‘yiladi? 1 bolsa-chi?
Misollar tuzing.
3) Harflar orasiga ko‘paytirish amali belgisi
(≪■≫) qo yilishi shartmi?
4) 0 ‘xshash hadlarni ixchamlash deganda nimani
tushunasiz? 3 — 4 ta misol keltiring.
491. Ifodaning koeffitsiyentini toping:
1) 23,4 a ■ b • 1,5 4) -0,12 m-(-0,5)-7 n;
2) - 6 • (3,7)a ■ 2,5b; 5) 3,2c-(-l,6)d-0,4e;
3) 7 x • (- 6,3) y • (- 4); 6) l,7a-(-5)b-2,4c.
492. Ifodani soddalashtiring va koeffitsiyentini
ajratib yozing: