Упростите выражение. 1) 5√2-11√2+67√2 2) -8√7+20√7-22√7 3) 14√3-√3-10√3 4)...

Question

Упростите выражение.
1) 5√2-11√2+67√2
2) -8√7+20√7-22√7
3) 14√3-√3-10√3
4) -20√13+18√13-2√13
5) 4√а+5√b-7√a
6) 0.3√x+0.2√y+0.6√x
7) √a-√b+29√a-√b
8) 48√x+2√x-2√y-50√x

Answer 1

1) 5√2 - 11√2 + 67√2 =  (5 - 11 + 67)√2 = 63√2.
2) -8√7+20√7-22√7 = (-8 + 20 - 22)√7 = -10√7.
3) 14√3-√3-10√3 = (14 - 1 - 10)√3 = 3√3. 
4) -20√13+18√13-2√13 = (- 20 + 18 - 2)√13 = - 4√13.
5) 4√а+5√b-7√a = (4 - 7)√a + 5√b = - 3√a + 5√b.
6) 0.3√x+0.2√y+0.6√x = (0,3 + 0,6)√x + 0.2√y = 0,9√x + 0,2√y
7) √a - √b + 29√a - √b = (1 + 29)√a - (1 + 1)√b = 30√a - 2√b.
8) 48√x+2√x-2√y-50√x = (48 + 2 - 50)√x - 2√y = 0·√x - 2√y = 0 - 2√y = - 2√y.