4-sinf matem 131-132-betlar harakatga doir doir masalalar

mavzu: harakatga doir masalalar yechish 131-132-betlar 4-topshiriq birining uzunligi 3 cm, ikkinchisiniki esa 4 cm bo‘lgan parallel kesmalar chizing. mustaqil topshiriqni tekshirish (131-b). 3 cm 4 cm d b c a ab cd 5-masala ikkita poyezd bir vaqtda bir-biriga qarab yo‘lga chiqdi. 1-poyezdning tezligi 65 km/h, 2-poyezdning tezligi 70 km/h. agar uchrashguncha 2-poyezd 280 km yurgan bo‘lsa, 1-poyezd qancha yo‘l yurgan? mustaqil topshiriqni tekshirish (131-b). 280km ?km 70km/h 65 km/h ?h mustaqilni topshiriqni tekshirish (131-b). 280 km yechish: 280:70=4 (h) – ikkinchi poyezd yurgan vaqt 2) 65 • 4=260 (km) – birinchi poyezd yurgan masofa javob: birinchi poyezd 260 km yurgan. 260 km 4 soat 1-masala. 1) yuk va yengil mashinalar 1 soatda necha kilometr yaqinlashadilar? 2 soatda-chi? 6 soatda-chi?...

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