若ab为有理数我们定义新的一种运算
原式=(2×1-2)⊕3,=0⊕3,
=2×0-3,
=-3.
故答案为:-3.
绛旓細(1) 5 (2) 2+(4/9)
绛旓細a*b=3a鍗2b锛(X鍗乊)*(x涓Y)=3(x鍗乊)鍗2(x涓Y)=5x鍗乊銆(5x鍗乊)*3x=3(5x鍗乊)鍗2x3X=21X鍗3Y銆
绛旓細-2*x-(2x)*3 =-2-2x-(2x-6)=-4x+4=0 鈭磝=1
绛旓細瀵逛簬涓や釜鏈夌悊鏁a,b,鎴戜滑瑙勫畾涓绉嶆柊杩愮畻鈥溾槄鈥:a鈽卋=a-2b 瑙f柟绋: 瀵逛簬涓や釜鏈夌悊鏁癮,b,鎴戜滑瑙勫畾涓绉嶆柊杩愮畻鈥溾槄鈥:a鈽卋=a-2b瑙f柟绋:-2鈽厁-(2x)鈽3=0... 瀵逛簬涓や釜鏈夌悊鏁癮,b,鎴戜滑瑙勫畾涓绉嶆柊杩愮畻鈥溾槄鈥:a鈽卋=a-2b 瑙f柟绋:-2鈽厁-(2x)鈽3=0 灞曞紑 鎴戞潵绛 ...
绛旓細21a+3b 瑕佺敤鏁翠綋鎹㈠厓鐨勬濇兂鍋
绛旓細瀹氫箟鐨勬柊浜戠畻甯﹁繘鍘荤畻灏卞ソ浜 杩欐椂鍊5+3鐩稿綋浜巃+b 鍗5+3锛2脳5-3/5+3锛堜綘纭畾杩欓噷娌℃湁鎷彿锛燂級鐒跺悗寰楀嚭鐨勫煎啀鍜2涓璧 寰楀嚭鐨勫煎氨鏄繍绠楅噷鐨刟锛2鏄痓鍐嶆寜缁欑殑鍏紡绠
绛旓細灏唡1/3-x -2/5| |2-x 6 |鍖栦负6锛1/3-x锛-[-2/5锛2-x锛塢=2 鍐嶆寜瑙f柟绋嬬殑鏂规硶姹傚嚭x 锛屽緱鍑簒=-2/31
绛旓細宸茬煡鏈夌悊鏁a锛b锛岀幇瑙勫畾涓绉嶆柊杩愮畻:a鈽哹=2a-3b-1锛岄偅涔堣浣 姹2鈽嗭紙锕3鍒嗕箣5锛夌殑鍊笺=2脳2-3脳(-5/3)-1 =4+5-1 =8;鎮ㄥソ锛屽緢楂樺叴涓烘偍瑙g瓟锛宻kyhunter002涓烘偍绛旂枒瑙f儜 濡傛灉鏈鏈変粈涔堜笉鏄庣櫧鍙互杩介棶锛屽鏋滄弧鎰忚寰楅噰绾 濡傛灉鏈夊叾浠栭棶棰樿閲囩撼鏈鍚庡彟鍙戠偣鍑诲悜鎴戞眰鍔╋紝绛旈涓嶆槗锛岃璋呰В...
绛旓細鍊掓帹鍥炲幓涓嶅氨琛屼簡 16=12-2x+2 =14-2x 2x=14-16 =-2 x=-1
绛旓細a * b=1/2a-2b 鍗砤=2 b=(-1)2 * (-1) =1/2a-2b=1/2脳2 - 2脳(-1)=1+2=3