老师给同学发作业本,若每人3本还剩9本,每人发5个,有一个人只发到4个问多少
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30\u672c
5人 24本绛旓細(34+10)梅(5-3)=22浜 22x3+34=100鏈
绛旓細璁炬湁瀛︾敓x鍚 5x锛4锛3x锛28 2x锛24 x锛12 绛旓細鏈夊鐢12鍚嶃傛湜閲囩撼
绛旓細璁炬湁X涓鍚屽锛屽師鏉ユ湁Y鏈浣滀笟鏈 3X+14=Y Y/4+12=X Y=4X-48 X=62 Y=200 鏈62涓汉锛姣忎釜浜閮借4鏈殑璇濆氨鎬诲叡瑕248鏈紝鍘熸潵鏈200鏈紝瑕佸啀涔248-200=48鏈
绛旓細璁句紭绉瀛︾敓鏈墄浜猴紝鈥姣忎汉鍙3鏈紝澶氫竴鏈濆垪寮忎负锛3x+1琛ㄧず鎬浣滀笟鏈鏁 鈥滄瘡浜哄彂5鏈紝灏33鏈濆垪寮忎负锛5x-33涔熻〃绀烘讳綔涓氭湰鏁 浣滀笟鏈暟鐩稿悓锛屽垯3x+1=5x-33 瑙f柟绋嬪緱x=17 灏唜=17甯﹀叆鈥3x+1鈥濇垨"5x-33"寰楁湰瀛愭暟閲忎负52鏈
绛旓細瑙:3脳16梅8 =48梅8 =6涓 绛:濡傛灉姣忎汉鍙8鏈彲浠ュ彂6涓鍚屽銆
绛旓細璁鍚屽x, 缁冧範鏈瑈 3x +80=y 5x -5<y 5x >y x,y 涓烘暣鏁 x 涓41 鏈鍚庡悓瀛﹀墿浣3 y 涓203 x 涓42 鏈鍚庡悓瀛﹀墿浣1 y 涓206
绛旓細鍒楁柟绋 3x+59=5x-k 鍥犱负姣忎汉鍙浜5鏈湁涓涓汉灏 鎵浠灏忎簬5澶т簬0 瑙f柟绋 x=(59+k)2 k=1鎴栬3 褰搆=1 x=30 k=3 x=31
绛旓細瑙o細璁炬湁y鏈紝鍓╀笅x鏈傚垯鏈夛細y=60+x (1)y=80-x (2)鏍规嵁 锛1锛夛紙2锛 鍙緱 x=10 y=70 鎵浠 鍏辨湁 70 鏈浣滀笟鏈銆備笉鎳傚彲杩介棶銆
绛旓細璁炬湁x浜.5x+10=20x-5 x=1 1*5+10=15涓 绛旓細鏈1涓汉,15涓浣滀笟鏈.
绛旓細锛163-13锛壝3锛=150梅3锛=50锛堜汉锛夛紱绛旓細涓夛紙1锛夌彮鏈50浜猴紟