6*(3х+5y)+7x-5y при х+y=3
6*(3х+5y)+7x-5y = 18х + 30у + 7х - 5у = 25х + 25у = 25(х+у) = 25 * 3 = 75
6*(3х+5y)+7x-5y=
18x+30y+7x-5y=
25x+25y=
25(x+y)
25*3=75
6*(3х+5y)+7x-5y при х+y=3
6*(3х+5y)+7x-5y = 18х + 30у + 7х - 5у = 25х + 25у = 25(х+у) = 25 * 3 = 75
6*(3х+5y)+7x-5y=
18x+30y+7x-5y=
25x+25y=
25(x+y)
25*3=75