“Agar siz matematikani juda murakkab deb o’ylasangiz, hayotning qanday murakkab ekanligini bilmas ekansiz”

№187 “Lacetti” avtomobili massasi 1246 kg, “Cobalt” avtomobili massasi esa 1149 kg. “Cobalt” avtomobili “Lacetti” avtomobilidan necha kilogrammga yengil?

Berilgan: “Lacetti” avtomobili-1246 kg

“Cobalt” avtomobili-1149 kg ?kg yengil

Yechish:

• 1246-1149=97 (kg) yengil

Javob:

“Cobalt” avtomobili “Lacetti” avtomobilidan

97 kgga yengil.

II.O’tilgan mavzuni so’rash:

“Kim topqir?” o’yini

1) 427 sonining 52 ta kamidan 90 ta ortiq sonni toping.

2) 6714 sonining 714 ta kamidan 500 ta ortiq sonni toping.

3) 100 sonining 22 ta ortig’idan 55 ta ortiq sonni toping.

4) 7458 sonining 64 ta kamidan 90 ta kam sonni toping.

5) 605 sonining 89 ta kamidan 987 ta ortiq sonni toping.

1) (427-52)+90=375+90=465

2) (6714-714)+500=6500

3) (100+22)+55=177

4) (7458-64)-90=

=7394-90=7304

5) (605-89)+987=516+987=1503

Mavzu:Sonli va harfli ifodalar.

6 sm

6 sm

Sonlar, arifmetik amallar va qavslardan tuzilgan ifodalar sonli ifodalar deyiladi.

4 sm

4 sm

P=2∙(6+4)=2∙6+2∙4=20

6 sm

6 sm

Sonlar, harflar, arifmetik amallar va qavslardan tuzilgan ifodalar harfli yoki harfiy ifodalar deyiladi.

a sm

a sm

P=2∙(6+a)=2∙6+2∙a

Masala:

Ishchi 2 soat ishladi. U birinchi soatda 12 dona, 2-soatda esa 1-soatdagidan m dona ko’p detal tayyorladi. Ishchi ikki soatda tayorlagan detallar sonini ifodalaydigan harfli ifoda tuzing.a) m=4 va b) m=8 ga teng bo’ladigan qiymatlarini toping.

1-soatda-12 dona d

2-soatda-12+m dona d

Yechish:

12+12+m (dona) detal

a)m=4: 12+12+4=28 (dona) detal

b)m=8: 12+12+8=32 (dona) detal

Javob: Ishchi ikki soatda

m=4: 28 dona,

m=8: 32 dona detal tayyorlagan.

?ta detal