Сделайте №1(а),№2(а),№3(б,в,г)

1. а) ОДЗ5у-1=05у=1у=1/5=0,23у+9=03у=-9у=-9/3у=-32.а) [latex] frac{0,6*5mn- m^{2}-3mn }{5n} = frac{3mn- m^{2}-3mn }{5n} = frac{ m^{2} }{5n} = frac{(-4)^{2} }{5*0.8}= frac{16}{4}=4 [/latex]3.б)[latex] frac{4c+3d}{(-1) ^{2}(4c+3d)^{2} }= frac{1}{4c+3d} [/latex]в)[latex] frac{(5a+2b) ^{2} }{(-1) ^{2}(5a+2b)^{2} }=1 [/latex]г) [latex] frac{3(a-2b)}{-a(a-2b)-c(a-2b)} = frac{3(a-2b)}{(-a-c)(a-2b)}= frac{3}{-a-c}=- frac{3}{a+c} [/latex]