=а^5(а³+1) / а²(а³+1)=а^5 / а²=а³
(-1/2)³=-1/8
1. ab-3a+3b-9
16+4y-4y-y^2=-y^2+16
c^2+ cp-pc-p^2=c^2-p^2
2. 64b^2+8b-8b-1=64b^2-1
36b^2+12b-12b-4=36b^2-4=4(9b^2-1)
9+36a-36a-144a^2=9-144a^2
3. a^2-2ab+2ab-4b^2=a^2-4b^2
16x^2+8xy-2xy-y^2= 16x^2+6xy-y^2
4c^2+10ac-10ac-25a^2=4c^2-25a^2
4. 5ab+25a^2-b^2-5ab= 25a^2-b^2
5x-x^2+25-5x= -x^2+25
64b-64b^2-64+64b= -64b^2-64
Cosx=(ab)/(|a| *|b|)
cosx=(2*(-4)+(-2)*1+1*1) /(coren(2^2+(-2)^2+1^2)(c0ren(-4)^2+1^2+1^2))=
=-9/(coren9 *coren18)=-9/)3*3coren2)=-1/coren2
x=pi-pi/4=3pi/4
Да.
(-7^2) = -7*-7=49.
<span>√49 = 7</span>