[tex]\displaystyle 1)-7,8x*5,5y=-(7,8*5,5)xy=-42,9xy\\\\2)-5a(-2b)(-0,1c)=-5a*2b*0,1c=-abc[/tex]
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[tex]\displaystyle 1)-7,8x*5,5y=-(7,8*5,5)xy=-42,9xy\\\\2)-5a(-2b)(-0,1c)=-5a*2b*0,1c=-abc[/tex]