Sonli va harfli ifodalar Dars maqsadi: ta’limiy maqsad
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Sonli va harfli ifodalar
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- Berilgan: “Lacetti” avtomobili-1246 kg
Sonli va harfli ifodalar Dars maqsadi:
Amaliyotga oshirish usuli: amaliy masalalarni yechish.Nutqda matematik terminlarni savodli qo’llay olish.Tashabbus ko’rsatish,tadbirkorlik,masalalar yechishda faoliyat ko’rsatish bo’yicha bilimlarni oshirish. Dars turi: yangi bilim berish. Dars jihozi: tarqatmalar, AKT, darslik. Dars metodi: tushuntirish, savol-javob, “Tez hisoblayman” ta’limiy o’yini. Tashkiliy qism
“Agar siz matematikani juda murakkab deb o’ylasangiz, hayotning qanday murakkab ekanligini bilmas ekansiz” №184 a) (3426+2345)-345=(2345-345)+3426= =2000+3426=5426 b) (3453+898)-2353=(3453-2353)+898= =1100+898=1998 d) (6578+1437)-1578=(6578-1578)+1437= =5000+1437=6437 №185 a) 12478-12378+7934=100+7934=8034 b) 38709+13576-21709=(38709-21709)+ +13576=17000+13576=30576 d) 28676+1111-21776=(28676-21776)+ +1111=6900+1111=8011 e) 41512+13924-23412=(41512-23412)+ +13924=18100+13924=32024 №186 To’g’ri to’rtburchak shaklidagi maktab hovlisining bo’yi 216 m, eni esa bo’yidan 45 m qisqa. Maktab hovlisining perimetrini hisoblang. Javob: Maktab hovlisining perimetri 774 m ekan. Berilgan: Bo’yi__ 216 m Eni____ ? ,45 m qisqa Perimetri- ? m Yechish:
Formula: P=(bo’yi+eni)∙2 2) P=(216+171) ∙2=774 (m) №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 yengilYechish:
Javob:“Cobalt” avtomobili “Lacetti” avtomobilidan97 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 5№188 Sonli ifodaning qiymatini toping.
5№189 Harfli ifodaning qiymatini toping. a)128-31=97 b)39-18=21 128-43=85 124-18=106 128-59=69 215-18=197 d)35+0=35 35+10=45 35+100=135 a)128-b= b=31; 43; 59 b)b-18= b=39; 124; 215 c)35+x= x=0; 10; 100 5№190 Harfli ifodaning qiymatini toping. a)(128-12∙3)+(14∙3-18)=116 (128-12∙4)+(14∙4-18)=118 (128-12∙5)+(14∙5-18)=120 b)(30∙4-25)-(20∙4+10)=5 (30∙8-25)-(20∙8+10)=45 (30∙10-25)-(20∙10+10)=65 a) (128-12b)+(14b-18)= b=3; 4; 5 b)(30y-25)-(20y+10)= b=4; 8; 10 Yangi mavzuni mustahkamlash Savollar:
Javoblar:
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