Question

решить:1)(a+b+c)+(a-b+c)2)(x-y+n)+(x-y-n) 3)(7a-3b)-(5a+3b)-(a-5b)4)(8x-5)+(3x-7)-(9x-11)5)43x-19y-(15x-34y)+(9x-7y)6) 48a-(2a-2b)-(14b-28a)+(24b-18a)7) 5-7a-(8-6a)+(5+a)

Answer 1

1) a+b+c+a-b+c=2a+2c=2(a+c)

2) x-y+n+x-y-n=2x-2y=2(x-y)

3)7a-3b-5a-3b-a+5b= a-b

4) 8x-5+3x-7-9x+11=2x-1

5) 43x-19y-15x+34y+9x-7y=37x-8y

6) 48a-2a+2b-14b+28a+24a-18a= 79a-12b

7) 5-7a-8+6a+5+a=2 

Answer 2

1) (a+b+c) + (a-b+c) = a + b + c + a - b + c = 2a + 2c

2) (x-y+n) + (x-y-n) = x - y + n + x - y - n = 2x - 2y

3) (7a-3b) - (5a+3b) - (a-5b) = 7a - 3b - 5a - 3b - a + 5b = 7a - 5a - a - 3b - 3b + 5b = 1a - 1b = a - b

4) (8x-5) + (3x-7) - (9x-11) = 8x - 5 + 3x - 7 - 9x + 11 = 8x + 3x - 9x - 5 - 7 + 11 = 2x - 1

5) 43x - 19y - (15x - 34y) + (9x - 7y) = 43x - 19y - 15x + 34y + 9x - 7y = 43x - 15x + 9x - 19y + 34y - 7y = 37x + 8y

6) 48a - (2a-2b) - (14b-28a) + (24b-18a) = 48a - 2a + 2b - 14b + 28a + 24b - 18a = 48a - 2a + 28a - 18a + 2b - 14b + 24b = 56a - 8a + 12b = 48a + 12b

7) 5 - 7a - (8 - 6a) + (5 + a) = 5 - 7a - 8 + 6a + 5 + a = 5 - 8 + 5 - 7a + 6a + a = 2 - 7a + 7a = 2