求初一上册数学书98页第三题答案
\u521d\u4e2d\u4e03\u5e74\u7ea7\u4e0a\u518c\u6570\u5b66\u4e66\u4e0a98\u9875\u4e60\u98983,3\u76845,6,7,8\u7684\u7b54\u68485\u3001 \u7528\u542bx\u7684\u5f0f\u5b50\u8868\u793a\u5f20\u660e\u6240\u7528\u65f6\u95f4\uff1ax-30
\u7528\u65b9\u7a0b\u6c42x\u7684\u503c\uff1a 10x=15(x-30)
x=90
\u5c71\u9ad8\uff1a90\u00d710=900\u7c73
6\u3001\u89e3\uff1a\u8bbe\u4e59\u8f66\u7684\u901f\u5ea6\u4e3axkm/h\uff0c\u7532\u8f66\u7684\u901f\u5ea6\u4e3a\uff082x+20)km/h.
1/2 x+ 1/2(2x+20)=298
x=192
\u75322\u00d7192+20=404km/h
7\u3001\uff081\uff09\u89e3\uff1a\u8bbe\u65e0\u98ce\u65f6\uff0c\u98de\u673a\u7684\u901f\u5ea6\u662fXkm/h
\uff0824+x)\u00d72.8=\uff08x-24)\u00d73
x=696
\u4e24\u573a\u4e4b\u95f4\u7684\u8ddd\u79bb\uff1a\uff08696-24\uff09\u00d73=2016km
8\u3001 \u89e3\uff1a\u8bbe\u84dd\u5e03\u6599\u4e70\u4e86x\u7c73\uff0c\u9ed1\u5e03\u6599\u4e70\u4e86\uff08138-x)\u7c73
3x+5\uff08138-x\uff09=540
x=75
\u9ed1138-75=63\u7c73
\u672a\u77e5 \u529d\u4f60\u81ea\u5df1\u638c\u63e1\u65b9\u6cd5 \u719f\u8bfb\u6df1\u601d\u81ea\u77e5\u96be
1、X=-17/5，2、X=5/6
3、Y=-1，
4、Y=4/7。
绛旓細1銆乆=-17/5锛2銆乆=5/6 3銆乊=-1锛4銆乊=4/7銆
绛旓細5x=-17 x=-浜斿垎涔嬪崄涓 鈶 -3锛坸-3锛=3x+4 -3x+9=3x+4 -3x-3x=4-9 -6x=-5 鈶 3锛3y-1锛-12=2锛5y-7锛9y-3-12=10y-14 9y-10y=-14+3+12 -y=1 y=-1 鈶 4锛5y+4锛+3锛坹-1锛=24-锛5y-5锛20y+16+3y-3=24-5y+5 20y+3y锛5y=24+5-16+3 28y=16 y=7...
绛旓細绛旓細A鐐规瘮B鐐归珮92.3绫筹紝C鐐规瘮B鐐归珮58.5绫筹紝A鐐规瘮C鐐归珮34.9绫炽傝嫢涓嶆槑鐧藉彲杩介棶锛岃阿璋紒
绛旓細x km/h,鍒欑敳鐨勯熷害涓(2x+20)km/h . 鐢遍鍙煡涓涓瓑閲忓叧绯伙細 鐢茬殑璺▼+涔欑殑璺▼=298銆傚彲鍒楀嚭鏂圭▼锛0.5x+0.5(2x+20)=298
绛旓細1 . 鈶燼=-2 鈶=1 鈶=2 鈶=-12 2. 鈶爔=19 鈶=-4/5 鈶=15/7 鈶=-44 3. 鈶爔=-17/5 鈶=5/6 鈶=-1 鈶=4/7
绛旓細鐢ㄦ柟绋嬫眰x鐨勫硷細 10x=15(x-30)x=90 灞遍珮锛90脳10=900绫 6銆佽В锛氳涔欒溅鐨勯熷害涓簒km/h锛岀敳杞︾殑閫熷害涓猴紙2x+20)km/h.1/2 x+ 1/2(2x+20)=298 x=192 鐢2脳192+20=404km/h 7銆侊紙1锛夎В锛氳鏃犻鏃讹紝椋炴満鐨勯熷害鏄疿km/h 锛24+x)脳2.8=锛坸-24)脳3 x=696 涓ゅ満涔嬮棿鐨勮窛绂...
绛旓細涓冨勾绾т笂鍐屾暟瀛︿功98椤,鎴戝繕甯︿功浜 2014浜烘暀鐗堢殑,绗3銆4棰樿藩姹,寰堟,甯釜蹇欏惂... 2014浜烘暀鐗堢殑,绗3銆4棰樿藩姹,寰堟,甯釜蹇欏惂 灞曞紑 鎴戞潵绛 1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?wzhq777 楂樼矇绛斾富 2014-11-06 路 璇寸殑閮芥槸骞茶揣,蹇潵鍏虫敞 鐭ラ亾椤剁骇绛斾富 鍥炵瓟閲:11.1涓 ...
绛旓細(1)1.2(x+4)=3.6(x-14)涓よ竟閮介櫎浠1.2 x+4=3(x-14)x+4=3x-3*14 4+3*14=3x-x 2x=4+3*14 x=2+3*7 x=23 (2)(1/2)(3y+1.5)=(1/4)(y-1)涓よ竟鍚屼箻浠4 2(3y+1.5)=y-1 6y+3=y-1 6y-y=-1-3 5y=-4 y=-(4/5)y=-0.8 ...
绛旓細鍒濅竴鏁板浜烘暀鐗98椤澶嶄範宸╁浐绗笁棰 2涓洖绛 #鐑# 涓轰粈涔堝瓟瀛愬儚浼氶洉鍒诲湪缇庢渶楂樻硶闄㈢殑闂ㄦィ涔嬩笂? ino闈╁懡 2013-11-23 鐭ラ亾绛斾富 鍥炵瓟閲:33 閲囩撼鐜:0% 甯姪鐨勪汉:18.5涓 鎴戜篃鍘荤瓟棰樿闂釜浜洪〉 鍏虫敞 灞曞紑鍏ㄩ儴 鏇村杩介棶杩界瓟 杩介棶 鏄1鍚? 杩界瓟 1鍟,浣犵Щ椤圭湅鐪 鏈洖绛旇鎻愰棶鑰呴噰绾 宸茶禐...
绛旓細2.锛1锛夎В锛2x+16=3x-3 2x-3x=-3-16 -x=-19 x=19 锛2锛夎В锛8x=-2x-8 10x=-8 x=-4/5 锛3锛夎В锛2x-2/3x-2=-x+3 7/3x
