3/7+8/10=30+56/70=86/70
2/9*5/10=5/45=1/9
3 1/8-1 6/10=25/8-60/10=250-480/80=-230/80=-23/8=-2,875
4 5/10:9/2=45/10*2/9=5/5=1
Ответ: недостаточно информации
2(m+1)^2+3(m+2)^2=2(m^2+2m+1)+3(m^2+4m+4)=2m^2+4m+2+3m^2+12m+12=5m^2+16m+14
A³b²+ab²-7a³b+7ab=ab²(a²+1)-7ab(a²+1)=(ab²-7ab)(a²+1)=ab(b-7)(a²+1)
a²b+a+ab²+b+3ab+3=ab(a+b+3)+(a+b+3)=(a+b+3)(ab+1)