Question

-3,4*2,7 -1 3/11*(-2 2/21) -12,72:(-15) -15,45:(-15)

Answer 1

Ответ:

-3,4*2,7=-9,18

-1 3/11*(-2 2/21)=-14/11*(-44/21)=14/11*44/21=2/1*4/3=8/3=2 2/3

-12,72:(-15)=0,848

-15,45:(-15)=1,03

Пошаговое объяснение:

Answer 2

Let's solve each of these expressions step by step:

1. -3,4 * 2,7: To multiply these two numbers, we'll treat the comma as a decimal point. Result: -3.4 * 2.7 = -9.18

2. -1 3/11 * (-2 2/21): First, we need to convert the mixed fractions to improper fractions: -1 3/11 = -14/11 -2 2/21 = -44/21

Now, we'll multiply the fractions: Result: (-14/11) * (-44/21) = 616/231 = 2 74/231 (2 and 74/231)

3. -12,72 : (-15): To divide these numbers, we'll use the rule that dividing by a negative number is the same as multiplying by its reciprocal (the inverse). Reciprocal of -15 = -1/15

Now, we'll multiply the numbers: Result: -12.72 * (-1/15) = 12.72/15 = 0.848 (rounded to three decimal places)

4. -15,45 : (-15): Again, we'll use the rule that dividing by a negative number is the same as multiplying by its reciprocal (the inverse). Reciprocal of -15 = -1/15

Now, we'll multiply the numbers: Result: -15.45 * (-1/15) = 15.45/15 = 1.030 (rounded to three decimal places)

So, the results of the expressions are:

1. -3,4 * 2,7 = -9.18
2. -1 3/11 * (-2 2/21) = 2 74/231 (or approximately 2.299)
3. -12,72 : (-15) = 0.848
4. -15,45 : (-15) = 1.030