... =0,25+K: 1 x ÊPhngtrỡnhtngng ( )2 2 2 1 1 2 1 1 2m x x x x x x + - + = - + + - + (2)0,25+t ( )( )2 222 2 2 2 1 2 1 1 0 . 1 1 1 t x xt x xt x x ỡ ù = + - ù ù = + - ịớ ù Ê + + - ù ... +Ơy'|| - - y 1 +Ơ - 1 0,25 1 (1, 0im)+th: th ctOy ti ( )00O th ctOx ti ( )00O Tõmixnglim ( ) 11 I .0,25+PT honhgiaoim2( ) 0 1 xx m g x x mx mx = - + = - + = - (1) vi1x ạ.0,25+ngthng ... +.0,25HNDCAA'B'C'D'BM*Tớnhthtớchtdin BMC'N: ( ) ( )' ' . ' ' ' ' 1 . , ' ' ' '3B MC N M B C N B C NV...