8)\r-6ab+5b2\r= a2 -6ah+9b2 -9h2 +5b2\r= (a-3bf-4/?\r= (a-3h+2h^a-3b-2t^\r=(a-t)(a-5Z>)\r( 2 ) `?a2- 184 + 21 =Ûs184+81-81 + 21 = (t- 9)2-60\rßca 7à(a-9)2 N O mãä6 0 , S(a-9)2-602-60,\rS(4-9)2-60åæÅ-60\r-/ - 1 8 a + 21æÅK-60.\rÀ`ç?ßca 7à-(t+ 1)240,mèé6 , S-(a + iy+646,\rS -(q+ 1)2+6åæì6\r^^{6? - + 12a - 6 = - (er - 12q + 36 - 36)- 6\r= -(a-6)2 +36-6\r-(a-6)2+30.\r-(a-6)~ < 0\r/.- ( a - 6 )2 +30<30\r--q+12a-6åæì30.\r@??p\r?? ` .ÊËh^_` !¹ºh8.h8.ÊËh^_`\r `? .\r3.(1) (3¢2x) (3£2x) (2)(ñ+3) 2\r@3p\r(1)ò h8T`9:\r(2)ò ¹ºh8`9:.\r@P`p\r`?¸ » = (3y) 2- (2x) 2\r= (3_y+2x) (3y-2x)\r(2)»=/+2?X?3+32\r= (B3) 2.\r@??p\r??8R`O ô õ ö ” b) (a-W, J± 2a9ú û±6 ) , `? .
全文预览
