Qulay usulda hisoblang: $67\cdot 43-43\cdot 37-30\cdot 23-20\cdot 10$
- A. 399
- B. 410
- C. 405
- D. 400
Natural sonlar va ular ustida amallar bo‘yicha savol
Javob va yechimni ko‘rish
Javob: 400
Ifodani guruhlab, umumiy ko‘paytuvchini ajratib olishimiz mumkin:
$$67\cdot 43-43\cdot 37-30\cdot 23-20\cdot 10
=43(67-37)-10(3\cdot 23+2\cdot 10).$$
Birinchidan $67-37=30$, shuning uchun $43\cdot30=1290$.
Keyin $3\cdot23+2\cdot10=69+20=89$, demak $10\cdot89=890$.
Natija $1290-890=400$, ya’ni javob **D**.
Mavzuni mustahkamlang
Bu savol Natural sonlar va ular ustida amallar mavzusiga tegishli. Ta’riflar, formulalar va misollarni mavzu sahifasida ko‘ring.
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