:2500000
2500000:160=15625
2)= -9с²+9с²+d²-d²=0
4)= (7b-t)(7b+t)+49b²+t²=49b²-t²+49b²+t²=98b²
6) =121c²+9-(11c²+66c)=121c²+9-11c²-66c=110c²+9-66c