Question

Помогите решить! Пожалуйста! Срочно! Даю 30 баллов.

Answer 1

Ответ:

1)3a+3+3a=6a+3=2a+1

2)2m-2+2m=4m-2=2m-1

3)5m+15n+4m-2n=9m+12n=3m-4n

4)3x+6y+8x-4y=11x-2y

Answer 2

Номер 1

1) 3a + 3(1 + a) = 3a + 3 + 3a = 6a + 3

2) 2(m - 1) + 2m = 2m - 2 + 2m = 4m - 2

3) 5(m + 3n) + 2(2m - n) = 5m + 15n + 4m - 2n = 9m + 13n

4) 3(x + 2y) + 4(2x - y) = 3x + 6y + 8x - 4y = 11x + 2y

Номер 2

1) 4 - 3(1,7x + 3) = 4 - 5,1x - 9 = -5,1x - 5

При х = 10, -5.1x - 5 = -51 - 5 = -56

2) 5 - 7(0,03x + 4) = 5 - 0,21x - 28 = -0,21x - 23

При х = -100, -0,21x - 28 = 21 - 28 = -7

3) 2a + 0,25(2,4a - 3) = 2a + 0,6a - 0,75 = 2,6a - 0,75

При a = 5, 2,6a - 0,75 = 13 - 0,75 = 12,25

4) 6a + 0,2(1,5a - 3) = 6a + 0,3a - 0,6 = 6,3a - 0,6

При a = 30, 6,3a - 0,6 = 189 - 0,6 = 188,04

Номер 3

1) A = 4(2x - 3), B = 5(2 + x) => A = 8x - 12, B = 10 + 2x

а) A + B = 8x - 12 + 10 + 2x = 10x - 2

б) A - B = 8x - 12 - 10 - 2x = 6x - 22

в) B - A = 10 + 2x - 8x + 12 = 22 - 6x

2) C = 3(x + 4), D = 2(1 - 3x) => C = 3x + 12, D = 2 - 6x

а) C + D = 3x + 12 + 2 - 6x = 14 - 3x

б) C - D = 3x + 12 - 2 + 6x = 9x + 10

в) D - C = 2 - 6x - 3x - 12 = -9x - 10

Надеюсь, помогло :)