Из равенства а+2*b=4 находим a=4-2b, тогда:
а=(4-2b)=64-96*b+48*b-8*b,
a+8*b=64-96*b+48*b,
64-24*a*b=64-24*b*(4-2*b)=64-96*b+48*b
Равенство доказано.
1) a + 2b = 4;
(a + 2b) = 4;
a + 4ab + 4b = 16;
2) a + (2b) = 64 — 24ab;
(a + 2b)*(a — 2ab + 4b) = 64 — 24ab;
4(a — 2ab + 4b) = 64 — 24ab;
a — 2ab + 4b = 16 — 6ab;
a + 4ab + 4b = 16;
16 = 16