1)
Объяснение:
64³/16⁵=(4³)³/( 4²)⁵=4⁹/4¹⁰= 4⁹⁻¹⁰=4⁻¹=1/4.
(7-х)²=(х+16)²
49-14х+х²=х²+32х+256
32х+14х=49-256
46х=-207
х=-207/46=-4,5.
