(238-149)+506=595
(48+16):(48-16)=64:32=2
(124+126)*(313-307)=250*6=1500
32*15-896:28=480-32=448
11) 117/13*3=27
15) 117/3*2=78
16) 45-45/3*1=30
18) 56-56/4*1=42
19) 35/5*1=7
20) 70/7*3=30
X=arcctga+Пk, k принадлежит Z
4sin30°+2cos60°-tg60°+2cos30°=
2cos30°+2cos60°- tg60° = 2* √3/2 + 2* 1/2 - √3= √3 + 1 - √3= 1
Y^2+3y-2y-6-y^2+1+25-y^2=-y^2+y+20