<span> 1) -5 (69-156) 2) 3•(60-171)=-5*(-87)=400+35=435
</span><span>2) 3•(60-171)=3*(-111)=-333
1) </span><span>(3/5-6/10)•4/6=4/6*0=0
2) </span><span>(1 8/7 - 6/49)=15/7-6/49=(15*7-6)/49=(105-6)/49=99/49=2 1/49</span>
-2x/7-3=1;
-2x/7=4;
x/7=-2;
x=-14.
=x(3a-x)
=ab(b+5a)
=2c(c³-2c²+1)
=(b-3)(b-4)
=2c(a+1)+b(a+1)=(a+1)(2c+b)
=6ab²(2a+ab+2b)
=b(b²-4b+4)+2b²-b³=b³-4b²+4b+2b²-b³=4b-2b²=2b(2-b)
=a(x-a)-5(x-a)=(x-a)(a-5)