<span>-34√3 cos(930) = <span>-34√3 cos(900+30) = <span>-34√3 cos(30)= <span>-34√3 * √3/2 = -34*3/2 = -51</span></span></span></span>
X²+4x+4 = (x+2)² = (98+2)²=100²=10000
(-32+2)²=-30²=900
(-2.5+2)²=-0.5²=0.25
3_1/8-1_3/4=3_1/8-1_6/8=2_9/8-1_6/8=1_3/8
Ответ:1_3/8