Boshlang'ich sinflarda matematika o'qitish metodikasi
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S = a b =
100 m m • 64 m m = 6 4 0 0 m m 2 = 64 sm 2. Javob: 64 sm 2. T o 'g 'r i to 'rtb u rc h a k n in g y u zi uning aso si b ilan b alan d lig in in g k o 'p a y tm a sig a teng: S~a-b (k v ad rat birlik ), b u n d a aso s a v a b alan d lik b b ir xil u zu n lik b irlik larid a ifodalanadi. 6 . K atak d aftarin g izg a asosi 6 katak, b alandligi 8 katak b o ig an t o 'g 'r i to 'rtb u rc h a k chizing. Shu t o 'g 'r i to 'rtb u rch ak n ech ta katak d an tuzilgan? Y u z l a r n i f o r m u l a y o r d a m i d a h i s o b l a s h 1. A sosi 5 sm va balan d lig i 3 sm boMgan t o 'g 'r i to 'rtb u rc h a k c h izin g . U n in g y o n ig a asosi 4 sm va balan d lig i 3 sm boMgan to 'g 'r i to 'rtb u rc h a k chizing. Bu to 'g 'r i to 'rtb u rc h a k la r y uzlari y ig 'in d is im ikki usul b ilan h isoblang: a) 3 -5 +3 • 4 b) 3 • (5 +4). 254 2. A so sin in g uzunligi 3 sm , balan d lig i 4 sm va aso sin in g uzu n lig i 5 sm , balandligi 4 sm b o ig an to ‘g ‘ri to ‘rtb u rch ak lam i y o n m a-y o n chizing. U la m in g yu zi y ig ‘indisini ikki usul b ilan hisoblang. 1 - v a 2 - m asalalard an q an d ay x u lo sag a k elish m um kin? t : — ■■' ■ ' 3. A sosi a, b alandligi b va asosi c, balan d lig i b boMgan to ‘g ‘ri to ‘rtb u rch ak lar y o n m a-y o n q o ‘yilgan. (a+ c)b = ab + b c ek anini k o ‘rsat- ing. Bu b ilan k o ‘paytirish am alin in g qo 'sh ish g a nisbatan taq sim o t q o n u n in i isbotlagan b o ‘lasiz. 4 . Jad v aln i toN diring. B unda S - to ‘g ‘ri t o ‘rtb u rch ak n in g yuzi, a - aso si, b - balandligi. S = a • b s 48 52 96 72 68 180 a 8 13 7 10 17 25 20 b 9 14 12 6 12 25 18 T o m o n lari butun so n lar va perim etri 12 sm boMgan to ‘g ‘ri t o 'r t b u rc h a k la r chizing. U la m in g yu zlarin i h isoblang. M os ja d v a l tuzing. Q an d ay shakl u chun y u z en g katta b ldi? b) П + П = 18 boMsa, П • П q a ch o n en g katta boMadi? 5. A so sin in g uzunligi 6 sm va b alandligi 4 sm boMgan 2 ta to ‘g ‘ri to 'rtb u rc h a k y o n m a-y o n v a ustm a-u st q o 'y ilg a n . M os shakl ch izin g , to 'g 'r i to 'b u rc h a k la rn in g perim etrini v a yu zin i h isoblang. 6 . T o m o n larin in g uzunligi butun so n lar va perim etri 20 sm boM g an t o 'g 'r i to 'rtb u rc h a k la r chizing. U larn in ig y u zlarin i h isoblang. T o m o n lari q an d ay b o 'lg a n d a yu zi en g katta b o 'ld i? Q anday shakl b lganda y u z en g katta b o 'ld i? P erim etrlari o 'z a ro ten g boM gan b arch a to 'g 'r i to 'rtb u rc h a k la r ich id a k v ad ratn in g yuzi en g katta boMadi. 7. T o 'g 'r i to 'rtb u rc h a k aso sin in g uzunligi 10 sm , balan d lig i u n d an 2 sm qisqa. Shu t o 'g 'r i to 'rtb u rc h a k n in g yu zin i va p erim etrin i toping. 8 . T o 'g 'r i to 'rtb u rch ak n in g perim etri 48 sm . T o m o n larid an biri 8 sm . U n in g yu zin i hisoblang. 255 9. R asm dagi sh ak ln in g y u zi 680 sm 2 bo'lsa, berilgan o lch am lar- d an foydalanib, x ni toping. T o ‘g ‘ri to ‘rtb u rch ak n in g tom onlari u zunliklari: a) 5 sm v a 6 sm ; b) 10 sm va 15 sm ; d) 12 sm va 17 sm ; e) 4 0 sm va 5 dm ; с) 1 m v a 8 dm ; g) 2 dm va 25 sm . U n in g perim etri va yu zin i hisoblang. Y u z v a p e r i m e t r n i h i s o b l a s h g a d o i r m a s a l a l a r M a s a l a . T o ‘g ‘ri to ‘rtb u rch ak n in g perim etri 56 sm . U ning bir tom oni ik k in ch isid an 8 sm uzun. Shu t o ‘g ‘ri to 'rtb u rc h a k n in g to m o n lari u zunliklarini toping. M asalani ikki usulda y ech ish m um kin. 1 u s u l : 1 ) to ‘g ‘ri to 'rtb u rc h a k q o 's h n i tom onlari u zu n lik larin in g y ig 'in d is i nech a santim etr? 56 sm : 2 = 28 sm. 2 ) to 'g 'r i to 'rtb u rc h a k ikkita qisqa tom oni u zu n lik larin in g y ig 'in d is i nech a santim etr? 28 sm - 8 sm = 20 sm. 3) to 'g 'r i to 'rtb u rc h a k n in g qisqa to m o n i uzunligi nech a san ti m etr? 20 sm : 2 = 10 sm. 4) t o 'g 'r i to 'rtb u rc h a k n in g uzun tom oni n echa san tim etr? 10 sm + 8 sm = 18 sm. Javob: T o 'g 'r i to 'rtb u rc h a k n in g tom onlari uzunliklari: 10 sm va 18 sm . T ekshirish: 10 + 1 0 + 18 + 18 = 56 (sm ). 2 u s u l : T o 'g 'r i to 'rtb u rc h a k n in g b ir tom oni (m asalan , qisqa tom oni) uzunligini x deb b elg ilasak , uzun tom oni x +8 b o 'la d i. T o 'g 'r i to 'rtb u rc h a k la r q o 's h n i tom onlari u zu n lik larin in g y ig 'in d is i 56 : 2 = 28 sm . M asala sh artig a m os ten g lam a tuzib, yecham iz: x+ (x + 8 )= 2 8 ; 2 x +8 = 28; 2 x = 28 - 8 ; 2 x= 20 ; x = 20 : 2 ; x = 10 sm; x + 8 = 1 0 + 8 = 1 8 (sm ). Javob: 10 sm v a 18 sm. 1. B o 'y i 4 0 0 m , eni 300 m b o ig an m aktab b o g 'i yu zin i k v ad rat m etr, a r va gek tard a ifodalang. 2. B erilg an o 'lc h a m la r b o 'y ic h a to 'g 'r i to 'rtb u rc h a k n m g yuzini S = a • b fo rm u lag a k o 'ra hisoblang: a, sm Download 7.79 Mb. Do'stlaringiz bilan baham: |
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