Х=2+2+1
У=5-2-1
Х=5
У =2
2×5× (5×2+2)+(5×2+2)+(5×2-1)=141
<span>x(y-7)+a(y-7)= (y-7)(x+a)
b(k+5)-n(5+k) = (k+5)(b-n)
y(p-6)+b(6-p) = </span>y(p-6)-b(p-6) = (p-6)(y-b)<span>
p(t-8)-k(8-t) = </span>p(t-8)+k(t-8) = (t-8)(p+k)<span>
5(a-b)</span>²-3(a-b) = (a-b)(5(a-b)-3) = (a-b)(5a-5b-3)
1)(1/3*a^2*b)^3*(9ab^2)^2=(1/27*a^6*b^3)(81a^2*b^4)=3a^8*b^7
2)(-5a^3*b)^2*(1/5*a*b^3)^3=(25a^6*b^2)*(1/125*a^3*b^9)=1/5*a^9*b^11
3)(-2/7a*b^4)^2*(-3 1/2a^3*b)^2=(4/49a^2*b^8)(49/4*a^6*b^2)=a^8*b^10
Х -цена тетради. 5х+2,6=8х-1,6. 3х=4,2. Х=4,2/3=1,4 грн