定义新运算a×b=3a+4b
即24星a=172=3*24+4*a所以a=25
绛旓細4.璁綼,b涓鸿嚜鐒舵暟锛瀹氫箟a*b=a脳b-(a-b),姹 锛1锛夛紙4*2锛+锛3*1锛=4脳2-(4-2)+3脳1-(3-1)=8-2+3-2 =7 锛2锛夛紙8*5锛-锛7*4锛=8脳5-锛8-5锛-[7脳4-锛7-4锛塢=40-3-[28-3]=37-25 =12 5.瑙勫畾a*b=3a-4b,宸茬煡12*x=4锛屾眰x 12*x =3脳12-4x =36-4x...
绛旓細21a+3b 瑕佺敤鏁翠綋鎹㈠厓鐨勬濇兂鍋
绛旓細鐢遍鎰忓緱锛坸+y锛夆伙紙x-y锛=3锛坸+y锛+2锛坸-y锛=5x+y锛屾墍浠锛坸+y锛夆伙紙x-y锛塢鈥3x=锛5x+y锛夆3x=3锛5x+y锛+2?3x=21x+3y锛
绛旓細鍥犱负4鈥1=3脳4-2脳1=10锛屾墍浠鈥伙紙4鈥1锛=x鈥10=3x-20锛庣敱3x-20=7锛岃В寰梮=9锛庢晠绛旀涓猴細9锛
绛旓細灏辨寜鐓х粰鐨璁$畻鍏紡鎸夐『搴忚绠 鍏堢畻7*6=3X7-2X6=21-12=9 鍐嶇畻9*5=3X9-2X5=27-10=17 璇烽噰绾炽
绛旓細2鈥5=3脳22+2脳5=22锛庢晠绛旀涓猴細22锛
绛旓細鈭礎鈥B=A鈥籅/A+B 鈭碅鈥籅=锛圓鈥籅/A+B锛/A+B 鈭碅鈥籅=A鈥籅/[锛圓+B锛壝楋紙A+B锛塢鈭碅鈥籅=A鈥籅/锛圓+B锛塣2 鈭碅鈥籅=A鈥籅/锛圓+B锛塣3 鈭碅鈥籅=0 鈭村師寮=0-10+0 =-10
绛旓細2*x=x*1 (1/3)2-(1/4)x=(1/3)x-(1/4)1 2/3+1/4=(1/3+1/4)x 8+3=(4+3)x 11=7x x=11/7
绛旓細鍥炵瓟锛(8鈥4)鈥5 =(8脳4-8梅4)鈥5 =30鈥5 =30脳5-30梅5 =150-6=144
绛旓細鍥犱负锛2*4=2脳2+4梅2锛=4+2锛=6锛屾墍浠ワ紙2*4锛*12锛=6*12锛=2脳6+12梅6锛=12+2锛=14锛涙晠绛旀涓猴細14锛