[tex]\displaystyle 1)5(2a-4,2b)=5*2a-5*4,2b=10a-21b\\\\2)3x-5(x+2y)-10y=3x-5x-10y-10y=-2x-20y[/tex]
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[tex]\displaystyle 1)5(2a-4,2b)=5*2a-5*4,2b=10a-21b\\\\2)3x-5(x+2y)-10y=3x-5x-10y-10y=-2x-20y[/tex]
3х-5(х+2у)-10у=3х-5х-10у-10у=-2х-20у