Предмет: Математика, автор: riqish376

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Ответы

Автор ответа: nolynux
1

Ответ:

1) (2×4×7 a b a^2 b^4 a b c)/3

(2 a b×4 a^2 b^4×7 a b c)/3 = (2 a^(2 + 1 + 1) b^(4 + 1 + 1) 4×7 c)/3

(2×4×7 a^(2 + 1 + 1) b^(4 + 1 + 1) c)/3

2 + 1 + 1 = 4

(2×4×7 a^4 b^(4 + 1 + 1) c)/3

4 + 1 + 1 = 6

(2×4×7 a^4 b^6 c)/3

2×4 = 8

(8×7 a^4 b^6 c)/3

8×7 = 56

ответ :(56 a^4 b^6 c)/3

2) (-2×27×5 a^2 b a b^3 a b^4)/(3×9)

(-2 a^2 b×27 a b^3×(5 a b^4)/9)/3 = (2 a^(2 + 1 + 1) b^(4 + 3 + 1) 27×5 (-1))/(9×3)

(-2×27×5 a^(2 + 1 + 1) b^(4 + 3 + 1))/(9×3)

2 + 1 + 1 = 4

(-2×27×5 a^4 b^(4 + 3 + 1))/(9×3)

4 + 3 + 1 = 8

(-2×27×5 a^4 b^8)/(9×3)

27/9 = (9×3)/9 = 3

(-2×3×5 a^4 b^8)/3

(2×3×5 (-a^4) b^8)/3 = 3/3×2×5 (-a^4) b^8 = 2×5 (-a^4) b^8

-2×5 a^4 b^8

2 (-5) = -10

ответ: -10 a^4 b^8

3)-4×2×8 x y^3 x y x^2 y^2

2 x y^3 (-4) x y×8 x^2 y^2 = 2 x^(1 + 1 + 2) y^(3 + 1 + 2) (-4)×8

-4×2×8 x^(1 + 1 + 2) y^(3 + 1 + 2)

3 + 1 + 2 = 6

-4×2×8 x^(1 + 1 + 2) y^6

1 + 1 + 2 = 4

-4×2×8 x^4 y^6

2 (-4) = -8

-8×8 x^4 y^6

-8×8 = -64

ответ: -64 x^4 y^6

4)(-3×3×2 c^3 d b c^2 d b^3 d)/(2×4)

(-3 c^3 d×(3 b c^2 d)/4×2 b^3 d)/2 = (3×3 c^(3 + 2) d^(1 + 1 + 1) b^(3 + 1) 2^(1 - 1) (-1))/4

(-3×3×2^(1 - 1) c^(3 + 2) d^(1 + 1 + 1) b^(3 + 1))/4

3 + 2 = 5

(-3×3×2^(1 - 1) c^5 d^(1 + 1 + 1) b^(3 + 1))/4

1 + 1 + 1 = 3

(-3×3×2^(1 - 1) c^5 d^3 b^(3 + 1))/4

3 + 1 = 4

(-3×3×2^(1 - 1) c^5 d^3 b^4)/4

1 - 1 = 0

(-3×3×2^0 c^5 d^3 b^4)/4

2^0 = 1:

(-3×3×1 c^5 d^3 b^4)/4

3 (-3) = -9

ответ: (-9 c^5 d^3 b^4)/4

^ - степень

/ - деление


riqish376: извините но не правильно
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5. Put the verb from bracket in Future Simple.

- I …………………………………… to Spain someday. (go)
- She ……………………………….. this movie. (not see)
- …………………………. you ……………………….. your grandmother this summer? (visit)
- We ………………………………. write this essay. (not write)
- ……………………… he ……………………… a birthday party this year? (throw)
- They ……………………………… for the taxi this time. (pay)

6. Put the verb from bracket in Present Perfect.

- I ……………………………….. no time to tidy my room. (have)
- She ………………………………… her work yet. (not finish)
- That book ………………………… on the table for weeks. (be)
- ……………….. you ………………….. to John lately? (talk)
- We ……………………………….. the butcher for over three weeks. (not pay)
- …………………. she ……………… anything today? (eat)
- I …………………………….. you since we met a year ago. (not see)
- How many times ………………… you …………………. so far? (lost)
- Bob and I ……………………………………. here for as long as I can remember. (live)

7. Insert FOR or SINCE

- We have been waiting here ……………………. an hour.
- We haven’t seen rain here …………………… more than 30 months.
- Everybody has recognized me ……………………. they saw me on TV.
- My parents have known each other …………………………. 1975.
- I haven’t watched any films …………………….. last month.
- I haven’t visited the Normans ………………… ages.
- Their son has been involved in modern art ……………… over five years.
- My mother hasn’t met Tom……………….. his birthday.
- My dad has had fie cigarettes ………………… he got up.