4х(х-5)-5(х решіть будь ласка умоляю

Пошаговое объяснение:

1.

1) 2(2x + 12y - 2z) = 4x +12 y - 2z

2) -6(-3a + 5b - 3c) = 18a -30b - 18c

3)  (–15,2а – 2b + 3,89) • (–2m) = 30,4am + 4bm - 7,88m

4)  –0,5n(2а – 5,5 + 2k) = -a + 2,75n -k

2.

1) 15х + 15у+15z = 15( x+y+z)

2) 12аb + 5bc – b = b(12b+5c -1)

3) 36xy – 16xy = 4xy (9-4) = 4xy * 5 = 20xy

3.

1) (z + 3,4) – (5,9 + z) = 2z - 2,5

2) –(15 – x + y) + (3,8 + y) = -15 +x - y + 3,8 + y = -11,2 +x

4.

1) 12x – 22x – 31x + 9x = -32x

2) –2у + 15у + 89y – 42y = 60y

1.

1) 5(9а –4b + с) = 45a - 20b +5c

2) –8(x – 8 – 7y) = -8x + 64 + 56y

3) –а(–b – 4,2d + 3c) = ab + 4,2ad -3ac

4) –0,8x(–7 – 3m + 1,2р) = 5,6x + 2,4xm - 0,76xp

2.

1) 6p – 6c = 6(p-c)

2) 5am – 8an + a = a(5m - 8n +1)

3) 14ab + 35bc = b(14a +35c)

3.

1) (5,3 + а) – (а + 6,4) = 5,3 + a - a +6,4 = 11.7

2) –(9,4 – b) + (–b + 3,7) = -9,4 +b -b +3,7 = -5,4

4.

1) 7а – 19а + 28a – 2a = 24a

2) –8x + 16x – 23x + 17x = 2x

5.

1) 8(6a – 7) – 17а = 48a -56 - 17a = 31a -56

2) 6b – 7(12 – 3b) = 6b - 84 - 21b = -15b -84

1 2/5 + 3 7/15 = 1 2*3/5*3 + 3 7/15 = 1 6/15 + 3 7/15 = 4 15/15 = 5

4 3/14 - 1 2/21 = 4 3*3/14*3 - 1 2*2/21*2 = 4 9/42 - 1 4/42 = 3 5/42

3 5/6 + 2 7/15 - 1 29/30 = 4 1/3
1) 3 5/6 + 2 7/15 = 3 5*5/6*5 + 2 7*2/15*2 = 3 25/30 + 2 14/30 = 5 39/30
2) 5 39/30 - 1 29/30 = 4 10/30 = 4 1/3

2 : 2 2/3 + 1 4/5 * 3 1/3 - 2 5/6 = 3 11/12
1) 2 : 2 2/3 = 6/3 : 8/3 = 6/3 * 3/8 = 3/4
2) 1 4/5 * 3 1/3 = 9/5 * 10/3 = 3*2=6
3) 3/4 + 6 = 6 3/4
4) 6 3/4 - 2 5/6 = 6 3*3/4*3 - 2 5*2/6*2 = 6 9/12 - 2 10/12 = 5 21/12 - 2 10/12 = 3 11/12