=2㏒7 21=2㏒7·(3·7)=2(㏒7 3+㏒7 7)=2㏒7 3+2
......................................................................
<span>2(x-y) \ x(y-x) =
= -2(у-х) </span><span>\ х(у-х) =
= минус за дробью 2 </span><span>\ х</span>
2/3=0,9
-6•(0,5•0,9)-(-6)•1,5-(4.5•0,9)-8=
-6•0,45+6•1,5-4,05-8=
-2,7+9-12,05=
-7,7-12,05=
-19,75