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sinitzyntoscha
@sinitzyntoscha
July 2022
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Помогите решить)
1)3x+2/8+5-x/4=3/4
2)упростите -3xy 2 умножить на (-2)xy^3
3)Решить систему уравнений 5(x-3y)=2x+27
3(x-6y)=9y+15
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Карамель505
1)3х+2/8+5-х/4=3/4 | *8
3х+2+2(5-х)=2*3
3х+2+10-2х-6=0
х+6=0
х= -6
2)-3ху^2 *(-2)ху^3 = ху^2 (-3* (-2)у) = ху^2*(-6)у = - 6ху^3
3)5(х-3у)=2х+27
3(х-6у)=9у+15
5х-15у-2х-27=0
3х-18у-9у-15=0
3х-15у-27=0 | : 3
3х-27у-15=0 | : 3
х-5у-9=0
х-9у-5=0
х=5у+9
5у+9-9у-5=0
-4у+4=0
-4у=-4
у=-4/-4
у=1
х=5*1+9
х=5+9
х=14
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Answers & Comments
3х+2+2(5-х)=2*3
3х+2+10-2х-6=0
х+6=0
х= -6
2)-3ху^2 *(-2)ху^3 = ху^2 (-3* (-2)у) = ху^2*(-6)у = - 6ху^3
3)5(х-3у)=2х+27
3(х-6у)=9у+15
5х-15у-2х-27=0
3х-18у-9у-15=0
3х-15у-27=0 | : 3
3х-27у-15=0 | : 3
х-5у-9=0
х-9у-5=0
х=5у+9
5у+9-9у-5=0
-4у+4=0
-4у=-4
у=-4/-4
у=1
х=5*1+9
х=5+9
х=14