∫(7t+9t^2)dx=7t²/2+3t³
∫(4+cosx)sinxdx=∫(4sinx+cosxsinx)dx=4∫sinxdx+(1/2)∫sin2xdx=-4cosx-(1/4)cos2x
1) 5 - 4x >0;
- 4x > - 5;
x < 1,25.
2)(5x - 1) /(3 - x) >0; ⇔(5x - 1)(3-x) >0; ⇔(5x - 1)( x-3) <0.
5x - 1 = 0; ⇒x = 0,2;
x - 3 = 0; ⇒ x = 3.
+ - +
---------------(0,2)----------------------(3)-------------------------x
x∈(0,2; 3)
А) 2.35•3.251=7.64
б) -4.3205•2.503=-10.81
в) 3•2.(1)=6.33