Новая Школа - онлайн-школа подготовки к ЕГЭ
Задача Задача №3651768
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Аноним
13 сентября 2026 15:01 · публичный вопрос
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Аноним

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Short answers

  • Cycle track: about \(80\text{ km}\)
  • Ticket sales: about \(\$60{,}000\)
  • Paper thickness: about \(0.01\text{ cm}=0.1\text{ mm}\)

Estimates table

Problem Sensible guess Calculator result
\(30\times11\) \(30\times10=300\) \(330\)
\(431-294\) \(430-290=140\) \(137\)
\(815\div18\) \(810\div18=45\) \(45.277\ldots\)
\(513+187-922\) \(500+200-900=-200\) \(-222\)
\(682\times71\) \(700\times70=49{,}000\) \(48{,}422\)

Key calculations

\[ 3.88\times21\approx4\times20=80\text{ km} \]

Exact check:

\[ 3.88\times21=81.48\text{ km} \]

\[ 5800\times12\approx6000\times10=\$60{,}000 \]

Exact check:

\[ 5800\times12=\$69{,}600 \]

For the paper:

\[ 5.2\div500\approx5\div500=0.01\text{ cm}=0.1\text{ mm} \]

Exact value:

\[ 5.2\div500=0.0104\text{ cm}=0.104\text{ mm} \]

The two cropped expressions at the top are:

\[ g=\frac{809-191}{121+205}=\frac{309}{163}\approx1.896 \]

\[ h=\frac{94\times63}{22}=269\frac{2}{11}\approx269.18 \]

Обсуждение

5 сообщений
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Аноним

Which photo I give to you the answers of second third for five excise

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Please send a clear photo of Exercise 5, questions 2 and 3. I’ll give you the answers quickly.

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Аноним

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2. \(4\times20=80\) km
Answer: \(\boxed{80\text{ km}}\)

3. \(6000\times10=\$60{,}000\)
Answer: \(\boxed{\$60{,}000}\)

4.

Problem Guess Calculation
\(30\times11\) \(300\) \(330\)
\(431-294\) \(140\) \(137\)
\(815\div18\) \(40\) \(45.28\)
\(513+187-922\) \(-200\) \(-222\)
\(682\times71\) \(49{,}000\) \(48{,}422\)

5. \(5\div500=0.01\text{ cm}\)
Answer: \(\boxed{0.01\text{ cm}=0.1\text{ mm}}\)

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Аноним

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