<u><em>
</em></u>
<u><em>
(5x^2+x-4)/(x^2+x)</em></u>=5[(x-0.8)(x+1)]/x(x+1)=5(x-0.8)/x=5x-4/x=<u><em>
5-4/x</em></u>
<u><em>
(t^4-bt^2+16)/(t+2)(t^2-4)</em></u>=[-bt^2-(t^4-16)]/(t^2-4)(t+2)=
-bt^2/(t+2)(t^2-4)-[(t^2-4)(t^2+4)]/(t^2-4)(t+2)=
-bt^2/(t+2)(t^2-4)-[(t-2)<u>(t+2)</u>(t^2+4)]/(t^2-4)<u>(t+2)</u>=
-bt^2/(t+2)(t^2-4)-(t-2)=
=<u><em>
2-t-bt^2/(t+2)(t^2-4)</em></u>
5дм=50см
Р=2(50+а)
!!!!!!!!!!!!!!!!!!!!!!!!!!
1.1)827-315=512
2)666-222=444
3)748-217=531
4)585-134=451
2. 1)30+6=36
2)20+4=24
3)36-24=12
Ответ:на 12 больше