Реши 5 уравнений ДАЮ 50 БАЛЛОВ!!!!!!!!!!!!!!!!!!
-4,5x+9=0
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3x+6=8x+21
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-2(3x+1)-4=5(-2x-3)
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x-5/2=3x+1/5
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8x+1/6-2x-1/2=2
-4,5x+9=0
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3x+6=8x+21
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-2(3x+1)-4=5(-2x-3)
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x-5/2=3x+1/5
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8x+1/6-2x-1/2=2
Answers & Comments
х=-2
2)3х-8х=21-6
-5х=15
х=-3
3)-6х-2-4=-10х-15
-6х+10х=-15+2+4
4х=-9
х=2.25
-4,5х=0-9 3х-8х=21-6 -6х-2-4=-10х-15
-4,5х=-9 -5х=15 -6х+10х=-15+6
х=-9(-4,5) х=15/(-5) 4х=-9
х=2 х=-3 х=-9/4
.................................. .................................. х=-2,25
Проверка:-4,5*2+9=0 3*(-3)+6=8*(-3)+21 ...............................
0=0 -3=-3 -2(3*(-2,25)+1))-4=5(-2*(-2,25)-3))
-11,75=-11,75
4)х-5/2=3х+1/5 5)8х+1/6-2х-1/2=2
х-3х=0,5+2,5 6х-1/3=2
-2х=3 6х=2+1/3
х=3/(-2) 6х=2 1/3
х=-1,5 х=2 1/3/6
х=7/18