Dau coroana. mersi anticipat
Răspunsuri la întrebare
Răspuns:
Explicație pas cu pas:
a)
12x + 10 = 7x + 21
12x - 7x = 21 - 10
5x = 11
x = 11/5
b)
8x - 26 = 14x - 35
14x - 8x = 35 - 26
6x = 9
x = 9/6 = 3/2
c)
10x - 41 = 3x - 27
10x - 3x = 41 - 27
7x = 14
x = 14/7 = 2
d)
14x + 7 = 20x - 17
20x - 14x = 17 + 7
6x = 24
x = 24/6 = 4
e)
5x + 17 = 13x - 15
13x - 5x = 17 + 15
8x = 32
x = 32/8 = 4
f)
15x + 12 = 11x + 9
15x - 11x = 9 - 12
4x = -3
x = -3/4
Explicație pas cu pas:
a) 12x+10=7x+21
12x- 7x= 21-10
5x= 11
x=11/5
b) 8x-26= 14x-35
8x- 14x =-35+26
-6x=-9 /×(-1)
6x=9
x= 9/6
c) 10x-41=3x-27
10x-3x = 41-27
7x= 14
x= 2
d) 14x+7= 20x-17
14x- 20x= -17-7
-6x=-24 / ×(-1)
6x= 24
x= 4
e) 5x+17= 13x- 15
5x- 13x = -15 - 17
-8x= -32 / ×(-1)
8x=32
x= 4
f) 15x +12=11x +9
15x -11x = 9- 12
4x= -3
x= -3/4