初二数学两个分式计算题。要一张纸写好过程拍给我。悬赏100（不低了…），圈了的两个 分式计算 悬赏100
\u521d\u4e8c\u6570\u5b66\u5206\u5f0f\u8ba1\u7b97\u9898\uff0c\u8981\u8fc7\u7a0b\uff0c\u8c22\u8c22\u7a0d\u7b49\uff0c\u8bf7\u597d\u8bc4
解：如上
绛旓細瑙ｏ細濡備笂
绛旓細宸茬煡1/x - 1/y=4锛岄偅涔堬細(y-x)/(xy)=4 鍒欐湁锛歽-x=4xy锛屽嵆x-y=-4xy 鎵浠ワ細鎵姹傚紡瀛=[2(x-y)+3xy]/[3(x-y)-xy]=(-8xy+3xy)/(-12xy-xy)=5/13
绛旓細=[(a+b)(a-b)]/[ab(a+b)]梅[-(a-b)²/2ab]=-[(a-b)/ab]脳[2ab/(a-b)²]=-2/(a-b)=-2/(2+鈭3-2+鈭3锛夛紳-1/鈭3锛-鈭3/3 2. .x婊¤冻x²-2x-3=0锛岋紙(x²-3/x-1)-2)梅1/x-1 锛漑(x²-3-2x+2)]/(x-1)梅1/(x-1)...
绛旓細鍒濅簩鏁板:鍒嗗紡璁＄畻棰 鎴戞潵绛 7涓洖绛 #鐑# 宸插濂虫у氨搴旇鎵挎媴瀹堕噷澶ч儴鍒嗗鍔″悧? 鍖垮悕鐢ㄦ埛 2014-08-10 灞曞紑鍏ㄩ儴 鏈洖绛旂敱鎻愰棶鑰呮帹鑽 宸茶禐杩 宸茶俯杩< 浣犲杩欎釜鍥炵瓟鐨勮瘎浠锋槸? 璇勮 鏀惰捣 鍖垮悕鐢ㄦ埛 2014-08-10 灞曞紑鍏ㄩ儴 杩界瓟 宸茶禐杩 宸茶俯杩< 浣犲杩欎釜鍥炵瓟鐨勮瘎浠锋槸? 璇勮 鏀惰捣 鍖垮悕鐢ㄦ埛...
绛旓細5-6+2x-12=7x-6x+8 x=21 瑙ｆ柟绋嬶細5x/锛坸²+x-6)+(2x-5锛/锛坸²-x-12)=锛7x-5锛/锛坸²-6x+8 锛夋柟绋嬩袱杈归兘涔(x-4锛(2x-2锛(x+3锛夊緱 5x锛坸-4)+(2x-5锛夛紙x-2)=锛7x-5锛夛紙x+3 锛-29x+10=16x-15 x=9/5 2.宸茬煡a²-6a+9涓巄-1鐨勭粷瀵瑰...
绛旓細鐪嬪浘鐗囧挴!!!~
绛旓細/锛圶^2-1)][(X-1)/(3X+2)=(6X+10)/(X+1)/(3X+2)=22/3/8=11/12 2銆(M+1-X)/(X-2)=-3 6-3X=M+1-X 2X=5-M X=(5-M)/2 X=2涓哄鏍广傛鏃讹紝M=1銆3銆佽绡悆鍗曚环涓篨锛屾帓鐞冧负X-30 1000/锛圶-30锛=1600/X 瑙ｅ緱X=80銆傜鐞冨崟浠蜂负80鍏/涓紝鎺掔悆涓50鍏/涓
绛旓細涓浠朵笂琛ｇ敤鏂檃/b 涓鏉¤￥瀛愮敤鏂2a/3b 涓浠朵笂琛ｆ槸涓鏉¤￥瀛愮殑(a/b)/(2a/3b)=3/2鍊
绛旓細4.閫氬垎锛 寮傚垎姣嶇殑鍒嗗紡鍙互鍖栨垚鍚屽垎姣嶇殑鍒嗗紡锛岃繖涓杩囩▼鍙仛閫氬垎銆傚锛3/2鍜2/3鍙寲涓9/6鍜4/6.鍗筹細3*3/2*3锛2*2/3*2锛 5.寮傚垎姣嶅垎寮忕殑鍔犲噺娉曟硶鍒欙細 寮傚垎姣嶇殑鍒嗗紡鐩稿姞鍑忥紝鍏堥氬垎锛屽寲涓哄悓鍒嗘瘝鐨勫垎寮忥紝鐒跺悗鍐嶆寜鍚屽垎姣嶅垎寮忕殑鍔犲噺娉曟硶鍒欒繘琛璁＄畻銆 (1).瀹氫箟锛氫竴鑸湴锛屽鏋淎锛孊琛ㄧず涓や釜鏁...
绛旓細=2/(1/a+1/(a+0.2))=2/[(2a+0.2)/(a(a+0.2))]=2a(a+0.2)/(2a+0.2)=(2a²+0.4a)/(2a+0.2) 鈶 鈶犲垎瀛愬垎姣嶉兘鍚屾椂X锛2a+0.2锛夊緱锛氾紙a+0.1锛(2a+0.2)/(2a+0.2)=(2a²+0.4a+0.02)/(2a+0.2)鈶 鈶㈡瘮鈶″ぇ 鎵浠モ憽鏈渚垮疁 鑾硅幑鐨勮吹锛屽溅褰︾殑鏈...
