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9835
@9835
December 2021
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Помогите пожалуйста решить уравнения
Даю 20 балов !Только решите хорошо !
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EvgenyPanf
1а) 3x+7=0
3x=-7
X=-7/3=-2 1/3
1б) 13-100x=0
100x=13
X=13/100
2a) 7x-4=x-16
7x-x=4-16
6x=-12
X=-12/6=-2
2б) 13-5x=8-2x
2x-5x=8-13
-3x=-5
X=5/3=1 2/3
2в) 4y+15=6y+17
6y-4y=15-17
2y-2
Y=-2/2=-1
3а) 5x+(3x-7)=9
5x+3x-7=9
5x+3x=9+7
8x=16
X=16/8=2
3б) 3y-(5-y)=11
3y-5+y=11
3y+y=11+5
4y=16
Y=16/4=4
4a) (7x+1)-(6x+3)=5
7x+1-6x-3=5
7x-6x=5-1+3
X=7
4б) (8x+11)-13=9x-5
8x+11-13=9x-5
8x-9x=13-11-5
-x=-3
X=3
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Answers & Comments
3x=-7
X=-7/3=-2 1/3
1б) 13-100x=0
100x=13
X=13/100
2a) 7x-4=x-16
7x-x=4-16
6x=-12
X=-12/6=-2
2б) 13-5x=8-2x
2x-5x=8-13
-3x=-5
X=5/3=1 2/3
2в) 4y+15=6y+17
6y-4y=15-17
2y-2
Y=-2/2=-1
3а) 5x+(3x-7)=9
5x+3x-7=9
5x+3x=9+7
8x=16
X=16/8=2
3б) 3y-(5-y)=11
3y-5+y=11
3y+y=11+5
4y=16
Y=16/4=4
4a) (7x+1)-(6x+3)=5
7x+1-6x-3=5
7x-6x=5-1+3
X=7
4б) (8x+11)-13=9x-5
8x+11-13=9x-5
8x-9x=13-11-5
-x=-3
X=3