<span>5/6 -4/9=15/18-8/18=7/18
</span><span>3 1/8+2 5/6=5+1/8+5/6=5+3/24+20/24=5 23/24
</span><span>5 11/12- 3 7/18=2 +(11/12-7/18)=2+(33/36-14/36)=2+19/36=2 19/36</span><span>
</span>
-8,5х+8,5.2у+1,7. 5х+1,7. -4у-х-11у=
=х+2у+8,5х-6,8у-х-11у=
=(х+8,5х-х)+(2у-6,8у-11у)=
=8,5х-15,8у
1) 96*2=192 кг с 6 яблонь. 2) 75/5=15 кг 1 ящик. 15*10=150 кг
-5х^2-10xy-5y^2= -(5x^2+10xy+5y^2)= -5(x^2+2xy+y^2)= -5(x+y)^2