【急!】(x+2y+3z)²=________________205²=299²=
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![【急!】(x+2y+3z)²=________________205²=299²=](/uploads/image/z/6856368-24-8.jpg?t=%E3%80%90%E6%80%A5%21%E3%80%91%28x%2B2y%2B3z%29%26%23178%3B%3D________________205%26%23178%3B%3D299%26%23178%3B%3D)
【急!】(x+2y+3z)²=________________205²=299²=
【急!】(x+2y+3z)²=________________
205²=
299²=
【急!】(x+2y+3z)²=________________205²=299²=
x²+4y²+9z²+4xy+6xz+12yz
(200+5)²=40000+25+2000=42025
(300-1)²=90000+1-600=89401