(50см - 30см) + (500см - 430см) = 20см + 70см = 90см= 9дм
1) = - 30 : (- 2 - 60 + 52) = - 30 : - 10 = + 3
2) ( - 18 - 49 + 17) :(-10) = - 50 : (- 10) = + 5
3) 16 - 2* ( - 13 + 20) = 16 - 2* 7 = 16 - 14 = + 2
4) - 27 - (- 2 - 21) = - 27 - (- 23) = - 27 + 23 = - 4
5) (- 3 * 17 ) + (- 32 ) : ( -2) = - 51 + 16 = - 35
3) y'= ((x-2)'*(x+2)-(x-2)*(x+2)')/(x+2)²= (x+2-x+2)/(x+2)²= 4/(x+2)²
4) ∫sin²xcosxdx= <u=sinx du=cosxdx>= ∫u²du= u³/3= sin³x/3