定义一种关于ab的新运算,a×b=3a+2b则中括号括号x+y×x+y括号乘3x化简得
由题意得（x+y）※（x-y）=3（x+y）+2（x-y）=5x+y，
所以[（x+y）※（x-y）]※3x=（5x+y）※3x=3（5x+y）+2•3x=21x+3y．
绛旓細鎵浠锛坸+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3锛坸+y锛+2锛坸锛峺锛+x
绛旓細鐧惧害
绛旓細a*b=a^2+ab 閭ｄ箞2*k=2^2+2k=4+2k 鎵浠1<4+2k鈮6 -3<2k鈮5 -3/2<k鈮5/2
绛旓細杩欐槸鏄熷彿杩愮畻,(-2)*7 =-2 脳7+5 =-14+5 =-9,9,(-2)*7 =-2 脳7+5 =-14+5 =-9,0,(--2)*7=(--2)x7+5=--14+5=--11,0,锛-2锛*7=鈥旓紙2*7锛=鈥旓紙2脳7+5锛=鈥19,0,
绛旓細鑻瀹氫箟涓绉嶆柊鐨勮繍绠*,瑙勫畾鏈夌悊鏁癮*b=4ab,濡2*3=4*3*4=24,鑻*b=b銆傚垯a鐨勫兼槸? a*b=b銆 4ab=b (4a-1)b=0 褰揵=0鏃锛宎涓轰竴鍒囨湁鐞嗘暟 褰揵鈮0鏃讹紝4a-1=0鍗砤=1/4 鑻ュ畾涔鏂拌繍绠 瑙勫畾浜 ab=a*b+4a 姹(-34)(-2)鐨勫 ab=a*b+4a --- (-34)(-2) ...
绛旓細鍥炵瓟锛6,,鎶妜浠ｅ叆杩欎釜寮忓瓙閲屽氨寰楀嚭銆
绛旓細(x+y)*(x-y)=(x+y)(x-y)+ (x+y)(x+y) - (x-y)(x-y) = x^2-y^2+4xy 鍏跺疄灏辨槸灏(x+y)褰撳仛a锛岋紙x-y锛夊綋鍋歜甯﹀叆鍒ab+a^2-b^2锛岀劧鍚庡睍寮鏁寸悊灏卞緱鍒颁簡
绛旓細a*b=a梅b脳5锛3 鍒30*6*7 =(30梅6脳5+3)*7 =28*7 =28梅7脳5+3 =4脳5+3 =23 甯屾湜鍙互甯埌浣狅紝^_^
绛旓細锛-1*2锛*3 =[锛-1锛 2 -锛-1锛壝2]*3 =3*3 =3 2 -3脳3 =0 鏁呯瓟妗堜负锛0锛
