Question

1) 12,8×0,7*12,8 2)2,3×3,2*2,34)7,25×0,14*7,255)9,31×1,14*9,31Сравните, не выполняя вычислений. Запишите результат с помощью знаков <, > или =даю 25 баллов.​

Answer 1

1)12,8*0,7<12,8

2)2,3<3,2*2,3

3)7,25>7,25*0,14

4)9,31<1,14*9,31

Answer 2

1. 12.8 × 0.7 * 12.8
2. 2.3 × 3.2 * 2.34
3. 7.25 × 0.14 * 7.25
4. 9.31 × 1.14 * 9.31

To compare these expressions without calculating, we can look at their patterns and make some observations:

1. 12.8 is multiplied by 0.7 and then by 12.8. Multiplying by 0.7 reduces the value, so the overall result is likely to be less than 12.8. Therefore, we can write: 12.8 × 0.7 * 12.8 < 12.8.

2. Similar to the first expression, we have multiplication by values less than 1. So, we can write: 2.3 × 3.2 * 2.34 < 2.3.

3. 7.25 is multiplied by 0.14 and then by 7.25. Again, multiplying by 0.14 reduces the value, so the overall result is likely to be less than 7.25. Hence, we can write: 7.25 × 0.14 * 7.25 < 7.25.

4. 9.31 is multiplied by 1.14 and then by 9.31. Since 1.14 is greater than 1, it will increase the value, so the overall result is likely to be greater than 9.31. Therefore, we can write: 9.31 × 1.14 * 9.31 > 9.31.

Comparing the expressions without calculating:

1. 12.8 × 0.7 * 12.8 < 12.8
2. 2.3 × 3.2 * 2.34 < 2.3
3. 7.25 × 0.14 * 7.25 < 7.25
4. 9.31 × 1.14 * 9.31 > 9.31

Based on these observations, the correct comparison is:

1. 12.8 × 0.7 * 12.8 < 12.8 < 2.3 × 3.2 * 2.34 < 7.25 × 0.14 * 7.25 < 9.31 × 1.14 * 9.31

Please note that the values provided are rounded to two decimal places, and the actual results may have more precise values.