1) a) 5*3=15
b) 1/5
2) a) b^(1/6)
b) y^(-2/3)
c) a^(3/2)
3) a) x^(7/4)*x^(1/4)=x²
4) a) (✓y+7)/(y+7✓y)=(✓y+7)/✓y(✓y+7)=1/✓y
b) (b-9)/(✓b+3)=✓b-3
46/10 ÷ (5/3-32/10)+11/8=46/10 ÷ (50-96)/30 +11/8= 46/10 ÷(-46/30) +11/8= 46/10 × (-30/46) + 11/8= -3+11/8= (-24+11)/8= -13/8
tg540=0 т.к sin540=0
cos(П-3П/4) + 0; -cos(П-П/4)+0= cosП/4 + 0= (корень 2)/2