Question

7. Упростите выражение. 21. 21m + 19m 22. -13n - 3,2n 23. -62x2 + 15x2 24. 16y2 - 48y2 25. 27x2y -0,9x2y 26.-5a2*(-21a2) 27. 1,2b*6b2 28. 63ab*(-2а) 29, 21b*ас 30. -Зmn2*17mn Помогите пожалуйста​

Answer 1

21. 21m + 19m = (21 + 19)m = 40m
22. -13n - 3,2n = (-13 - 3,2)n = -16,2n
23. -62x² + 15x² = (-62 + 15)x²= -47x²
24. 16y² - 48y² = (16 - 48)y² = -32y²
25. 27x²y -0,9x²y=26,1x²y
26. -5a²·(-21a²) = 105a⁴
27. 1,2b·6b² = 7,2b¹·b²=7,2b¹⁺²=7,2b³
28. 63ab·(-2а) = -126a²b
29. 21b·ас=21abc
30. -Зmn²·17mn = -51m²n²·n¹ = -51m²n²⁺¹ = -51m²n³

Answer 2

Simplifying Expressions

Let's simplify the given expressions one by one:

21 + 21m + 19m + 22

To simplify this expression, we can combine the like terms:

21 + 21m + 19m + 22 = 43 + 40m

-13n - 3.2n + 23

Similarly, we can combine the like terms:

-13n - 3.2n + 23 = -16.2n + 23

-62x^2 + 15x^2

Here, we have two terms with the same variable, x^2. We can combine them:

-62x^2 + 15x^2 = -47x^2

16y^2 - 48y^2

Again, we have two terms with the same variable, y^2. We can combine them:

16y^2 - 48y^2 = -32y^2

27x^2y - 0.9x^2y

Combining the like terms:

27x^2y - 0.9x^2y = 26.1x^2y

-5a^2 * (-21a^2)

When multiplying two negative numbers, the result is positive:

-5a^2 * (-21a^2) = 105a^4

1.2b * 6b^2

Multiplying the coefficients and adding the exponents:

1.2b * 6b^2 = 7.2b^3

63ab * (-2a)

Multiplying the coefficients and combining the variables:

63ab * (-2a) = -126a^2b

21b * ac

Multiplying the coefficients and combining the variables:

21b * ac = 21abc

-Zmn^2 * 17mn

Multiplying the coefficients and combining the variables:

-Zmn^2 * 17mn = -17m^2n^3

Therefore, the simplified expressions are: - 43 + 40m - -16.2n + 23 - -47x^2 - -32y^2 - 26.1x^2y - 105a^4 - 7.2b^3 - -126a^2b - 21abc - -17m^2n^3

I hope this helps! Let me know if you have any further questions.