一个三层书架共放书120本上层比中层多8本下层比中层少放2本上中下各放多少本 一个三层书架共放树490本,上层比中下两层的和少70本,中层...
\u4e00\u4e2a\u2261\u5c42\u4e66\u67b6\u5171\u653e\u4e66120\u672c\uff0c\u4e0a\u5c42\u6bd4\u4e2d\u5c42\u591a8\u672c\uff0c\u4e0b\u5c42\u6bd4\u4e2d\u5c42\u5c112\u672c\uff0c\u4e0a\u4e2d\u4e0b\u5404\u653e\u4e66\u591a\u5c11\u8bbe\u4e0a\u4e2d\u4e0b\u4e09\u5c42\u5404\u653ex,y,z\u672c\u4e66
\u7531\u9898\u53ef\u5f97\uff081\uff09x+y+z=120 (2)x-y=8 (3)y-z=2
\u7531\u65b9\u7a0b\uff082\uff09\u5f97\u51fa(4)x=8+y,\u7531\u65b9\u7a0b\uff083\uff09\u5f97\u51fa\uff085\uff09z=y-2
\u628a\u65b9\u7a0b\uff084\uff09\u548c\uff085\uff09\u4ee3\u5165\u65b9\u7a0b\uff081\uff09\u5f97\u51fa
\uff088+y\uff09+y+(y-2)=120
3y=114
y=38
\u628ay=38\u5206\u522b\u4ee3\u5165\u65b9\u7a0b(3)\u548c(4)\u5f97\u51fa
x=46,z=36
\u6240\u4ee5\u4e0a\u4e2d\u4e0b\u4e09\u5c42\u5404\u653e\u4e8646\u672c\uff0c38\u672c\u548c36\u672c\u4e66
\u89e3\uff1a\u4e0a\u5c42\u653e \uff08490-70\uff09\u00f72=210\u672c
\u4e2d\u4e0b\u4e24\u5c42\u4e00\u5171\u653e 490-210=280\u672c
\u4e2d\u5c42\u653e \uff08280+10\uff09\u00f72=145\u672c
\u4e0b\u5c42\u653e 280-145=135\u672c
\u7b54\uff1a\u4e0a\u5c42\u653e 210\u672c\uff0c\u4e2d\u5c42\u653e 145\u672c\uff0c\u4e0b\u5c42\u653e 135\u672c\u3002
上层放46本,中成放38本,下层放36本
绛旓細涓眰锛120-8+2锛壝3 =114梅3 =38鏈 涓婂眰38+8=46鏈 涓嬪眰38-2=36鏈
绛旓細锛8+y锛+y+(y-2)=120 3y=114 y=38 鎶妝=38鍒嗗埆浠e叆鏂圭▼(3)鍜(4)寰楀嚭 x=46,z=36 鎵浠ヤ笂涓笅涓夊眰鍚勬斁浜46鏈紝38鏈拰36鏈功
绛旓細涓嬪眰锛120梅3+20=60锛堟湰锛変粠涓眰鍙栧嚭涓庝笅灞傚悓鏍峰鐨勪功鏀惧湪涓嬪眰涔嬪墠锛涓婂眰锛20鏈 涓嬪眰锛60梅2=30锛堟湰锛変腑灞傦細40+30=70锛堟湰锛変粠涓婂眰鍙栧嚭涓庝腑灞傚悓鏍峰鐨勪功鏀惧湪涓眰涔嬪墠锛堝師鏉ワ級锛氫腑灞傦細70梅2=35锛堟湰锛変笂灞傦細20+35=55锛堟湰锛変笅灞傦細30鏈 鈭磋繖涓涔︽灦鐨勪笂锛屼腑锛屼笅灞傚師鏉ュ悇鏈55鏈35鏈30鏈功 ...
绛旓細120-15=105锛堢浜屽眰涔︽灦鐨勬湰涔+绗涓夊眰涔︽灦鐨勬湰涔︼級璁剧涓夊眰鏀綳鏈功 鐢遍鎰忕煡锛岀浜屽眰涔︽灦鏀句簡110%X X+110%X=105 瑙e緱 X=50 鎵浠ワ紝绗笁灞傛斁50鏈功 鏄庣櫧浜嗕箞锛
绛旓細40 浠庝笅灞傚彇鍑哄墠 20 40 60 浠庝腑灞傚彇鍑哄墠 20 70 30 鍘熸潵 55 35 30 绛旓細杩欎釜涔︽灦鐨勪笂銆佷腑銆佷笅灞傚師鏉ュ悇鏈55銆35銆30鏈功銆
绛旓細120梅2/5=300鏈 鎬绘暟 300-120=180鏈 涓眰涓庝笅灞傛湰鏁板拰 180*4/(5+4)=80鏈
绛旓細绗竴灞傛斁15鏈鏄庣浜屽眰鍜绗笁灞鎬诲叡鏀句簡105鏈
绛旓細120鏈涔﹀垎涓夊眰锛屾瘡灞涔︽湰鏁扮洰涓鑷达紝灏辨槸40鏈竴灞傘傜涓灞傛斁鍏13鏈埌绗簩灞傦紝閭d箞鍙互鎺ㄧ畻鍑虹浜屽眰鐨勪功鏁扮洰鏄40-13=27鏈紱绗竴灞傛斁鍏8鏈埌绗笁灞锛屽彲浠ユ帹绠楀嚭绗笁灞傜殑涔︽暟鐩槸40-8=32锛涜繖鏍风涓灞傜殑涔︽暟鐩氨鏄40+13+8=61.
绛旓細瑙o細涓笅涓ゅ眰涓鍏辨湁 120梅40%-120=180鏈 涓眰鏈 180梅锛5+4锛墄5=100鏈 涓嬪眰鏈180-100=80鏈 绛旓細涓眰鏈 100鏈紝涓嬪眰鏈80鏈
绛旓細鑻涓夊眰鍧囩浉绛夛紝鍗虫瘡灞備负鎬绘暟8/24锛岃岀涓灞傚鍔5鏈嵆鍙揪鍒颁笁灞傜浉绛夌殑8/24锛岃鏄 8/24-7/24=1/24=5锛堟湰锛夊垯涔︽灦涓婃绘暟涓5/锛1/24锛=120锛堟湰锛