S=a*b*sinα.
a=9
b=14
sinα=30 ⇒ 1/2
S=9*14*0.5=126*0.5=63см²
А) -6(m^2-16) или 96-6m^2
b) 25a^4-b^2-25a^4=-b^2
c) 0,36n^2-(0,36n^2-n^4)=n^4
А) 5 - ( a - 3) = 5 - a + 3 = 8 - a
Б) 7 + ( 12 - 2b) = 7 + 12 - 2b = 19 - 2b
В) 64 - ( 14 - 7x) = 64 - 14 + 7x = 50 + 7x
Г) 38 + ( 12p - 8) = 38 + 12p - 8 = 30 + 12p = 6 ( 5 + 2p)