Question

Вычислите удобным способом. а) 27 · 15 + 17 · 15 − 24 · 15;пж заметьте б) 13 · 45 − 27 · 13 + 12 · 13.

Answer 1

Ответ:

Пошаговое объяснение:

а) 27 · 15 + 17 · 15 − 24 · 15 = 15 · (27 + 17 - 24) = 15 · 20 = 300

б) 13 · 45 − 27 · 13 + 12 · 13 = 13 · (45 - 27 + 12) = 13 · 30 = 390

Answer 2

Calculation of Expression a)

To calculate the expression a) 27 · 15 + 17 · 15 - 24 · 15, we can use the distributive property of multiplication over addition and subtraction.

First, we can simplify the expression by multiplying each term separately:

27 · 15 = 405 17 · 15 = 255 24 · 15 = 360

Now, we can substitute these values back into the expression:

405 + 255 - 360

Next, we can perform the addition and subtraction:

405 + 255 = 660 660 - 360 = 300

Therefore, the value of the expression a) 27 · 15 + 17 · 15 - 24 · 15 is 300.

Calculation of Expression b)

To calculate the expression b) 13 · 45 - 27 · 13 + 12 · 13, we can follow a similar process.

First, we can simplify the expression by multiplying each term separately:

13 · 45 = 585 27 · 13 = 351 12 · 13 = 156

Now, we can substitute these values back into the expression:

585 - 351 + 156

Next, we can perform the addition and subtraction:

585 - 351 = 234 234 + 156 = 390

Therefore, the value of the expression b) 13 · 45 - 27 · 13 + 12 · 13 is 390.

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