书架上,下两层共有书80本。如果从上层搬出5本放到下层,那么下层书的本数与上层的同样多。书架的上,
\u4e00\u4e2a\u4e24\u5c42\u4e66\u67b6\uff0c\u4e0a\u5c42\u653e\u7684\u4e66\u6bd4\u4e0b\u5c42\u76843\u500d\u591a18\u672c\uff0c\u5982\u679c\u628a\u4e0a\u5c42\u7684\u7684\u4e66\u62ff\u51fa80\u672c\u653e\u5230\u4e0b\u5c42\u4e24\u5c42\u6240\u653e\u4e66\u7684\u7684\u7b49\u6570\u76f8\u7b49\u8bbe\u4e0b\u5c42\u7684\u4e66\u6709x\u672c,\u5219\u4e0a\u5c42\u7684\u4e66\u6709(3x+18)\u672c\u3002
3x+18-80=x+80
x=71
\u5219\u539f\u6765\u4e0a\u5c42\u7684\u4e66\u67093\u00d771+18=231\u672c\uff0c\u4e0b\u5c42\u7684\u4e66\u670971\u672c\u3002
\u8bbe\u4e0b\u5c42\u6709x\u672c\uff0c\u4e0a\u5c42\u5c31\u67091.5x\u672c\u3002
\u7531\u9898\uff1a1.5x-5=x+5
1.5x=x+10
1.5x-x=x+10-x
0.5x=10
x=20
20*1.5=30
\u7b54\uff1a\u539f\u6765\u4e0a\u5c4230\u672c \u4e0b\u5c4220\u672c
绛旓細涔︽灦鐨勪笂涓嬩袱灞鍘熸潵鍚勬湁锛45锛夈侊紙35锛夋湰涔︼紱80/2+5 =45 80-45 =35
绛旓細涓婂眰鏈45鏈笅灞傛湁35鏈
绛旓細鍘熸潵涓婂眰鏈夛細40+5=45锛堟湰锛夊師鏉ヤ笅灞傛湁锛40-5=35锛堟湰锛
绛旓細3锛坸-15锛=80-x+15 瑙e緱x=35 鎵浠ュ師鏉ヤ笂灞傛湁35鏈,涓嬪眰鏈80-35=45鏈
绛旓細瑙o細璁惧師鏉ヤ笂灞傛湁x鏈紝鍒欙細x-10=80-x+10 瑙e緱锛歺=50 80-50=30鏈 绛旓細鍘熸潵涓婂眰鏈50鏈紝涓嬪眰鏈30鏈=== 鏌虫氮闂昏幒鍚勪綅鑺濋夯绔瘹涓烘偍瑙g瓟 鎮ㄧ殑閲囩撼鏄垜浠潥鎸佺櫨搴︾殑鍔ㄥ姏 ===
绛旓細瑙o細璁捐繖涓涔︽灦涓嬪眰鏈変功x鏈紵x-15脳2+x=80 瑙e緱锛歺=55 绛旓細杩欎釜涔︽灦涓嬪眰鏈変功55鏈
绛旓細涓嬶紙80-20锛壝2锛30锛屼笂50
绛旓細鎮ㄥソ锛氫笂灞傛湁锛80梅锛1+1-1/6脳2锛=80梅5/3=48 涓嬪眰鏈夛細80-48=32鏈 濡傛湁涓嶆槑鐧斤紝鍙互杩介棶 濡傛湁甯姪锛岃寰楅噰绾筹紝璋㈣阿 绁濆涔犺繘姝ワ紒
绛旓細鍏崄闄や互浜岀瓑浜庡洓鍗侊紝鍥涘崄鍔犲叓绛変簬鍥涘崄鍏湰
绛旓細80/锛3+1锛壝3=60