E.689. Rezolvați ecuațiile: a) 2x2=33−32:(26−25−24−23−22−21−20);2x^2=3^3-3^2:(2^6-2^5-2^4-2^3-2^2-2^1-2^0);2x2=33−32:(26−25−24−23−22−21−20); b) x2=2⋅22⋅222:[2+22+222:(222−22⋅2)].x^2=2\cdot 2^2\cdot 2^{2^2}:\big[2+2^2+2^{2^2} :(2^{2^2}-2^2 \cdot 2)\big].x2=2⋅22⋅222:[2+22+222:(222−22⋅2)].