一个24块砖,一个男人搬三块,两个女人抬一块,三个小孩抬一块,怎样人数和砖数都是24? 24个人搬24块砖1个男人搬3块2个女人搬1块3个小孩抬1块...
\u4e00\u517124\u5757\u7816\uff0c1\u4e2a\u7537\u4eba\u62ac\u4e00\u5757\uff0c2\u4e2a\u5973\u4eba\u4e00\u8d77\u62ac\u4e00\u5757\uff0c3\u4e2a\u5c0f\u5b69\u4e00\u8d77\u5757\u4e00\u5757\uff0c\u600e\u6837\u7816\u6570\u548c\u4eba\u6570\u90fd\u662f24\uff1f19\u4e2a\u7537\u4eba\uff0c2\u4e2a\u5973\u4eba\uff0c3\u4e2a\u5b69\u5b50\u6b63\u597d\u662f24\u4e2a\u4eba\uff0c\u4f46\u53ea\u53ef\u4ee5\u642c\uff0819+1+1=\uff0921\u5757\u7816\u3002\u8fd9\u662f\u5728\u8981\u6709\u7537\u4eba\uff0c\u8981\u6709\u5973\u4eba\u4e5f\u8981\u6709\u5c0f\u5b69\u5b50\u7684\u60c5\u51b5\u4e0b\u642c\u7816\u6700\u591a\u7684\u6570\u5b57\u4e86\u3002\u5982\u679c\u4e00\u5b9a\u8981\u6309\u9898\u76ee\u8981\u6c42\u53bb\u505a\u7684\u8bdd\uff0c\u90a3\u5c31\u53ea\u670924\u4e2a\u7537\u4eba\u642c24\u5757\u7816\uff0c\u5973\u4eba\u548c\u5c0f\u5b69\u5b50\u90fd\u4e0d\u5b58\u5728\u7684\u60c5\u51b5\u4e0b\u624d\u6709\u53ef\u80fd\u5b9e\u73b0\u9898\u610f\u4e86\u3002
\u8bbe\u6709a\u4e2a\u7537\u4eba\uff0cb\u4e2a\u5973\u4eba\uff0cc\u4e2a\u5c0f\u5b69
3a+b/2+c/3
=
24a+b+c
=
24b\u4e3a\u5076\u6570\uff0cc\u4e3a3\u7684\u6574\u6570\u500d\uff0ca\u3001b\u3001c\u5747\u4e0d\u5c0f\u4e8e0
\u5219\u53ef\u5f97a
=
6\uff08a
<
6\u65f6\u7816\u642c\u4e0d\u5b8c\uff0c
a
>
6\u65f6\u4eba\u7528\u4e0d\u5b8c\uff09a
=
6\u65f6\uff0c
\u4ec5\u6709b
=
0\uff0c
c
=
18\u6ee1\u8db36\u4e2a\u7537\u4eba0\u4e2a\u5973\u4eba18\u4e2a\u5c0f\u5b69
24-x-y,
则
x/2+y/3+3×(24-x-y)=24
48=5/2x+8/3y
288=15x+16y,
x,y都是整数,
所以x=16,y=3,即女人16人,小孩3人,男人5人。
绛旓細涓鍏辨湁24鍧楃爾锛岀幇鍦涓涓敺浜鍙互鎼3鍧楃爾锛屼袱涓コ浜烘姮涓鍧楃爾锛屼笁涓皬瀛╂姮涓鍧楃爾锛岃浣夸汉鏁颁篃鏄24浜恒傝鏈墄涓コ浜猴紝鏈墆涓皬瀛╋紝鍒欑敺浜烘湁 24-x-y锛屽垯 x/2+y/3+3脳(24-x-y锛=24 48=5/2x+8/3y 288=15x+16y锛寈锛寉閮芥槸鏁存暟锛屾墍浠=16锛寉=3锛屽嵆濂充汉16浜猴紝灏忓3浜猴紝鐢蜂汉5浜恒
绛旓細鍋囪鏈 $x$ 涓敺浜猴紝$y$ 涓コ浜猴紝$z$ 涓皬瀛╋紝鍒欏彲浠ュ垪鍑哄涓嬫柟绋嬶細3x + 2y + 3z + 3 = 24 鍖栫畝寰楋細3x + 2y + 3z = 21 鍙堝洜涓轰汉鏁版诲叡鏈 $x + y + z = 24 - 3 = 21$ 浜猴紝鍥犳鍙互鍒楀嚭鍙涓涓鏂圭▼锛歺 + y + z = 21 鐜板湪鎴戜滑鏈変袱涓柟绋嬶紝鍙互鐢ㄥ畠浠潵瑙f柟绋嬬粍銆傚皢绗...
绛旓細璁炬湁x涓敺浜猴紝y涓コ浜猴紝z涓皬瀛╋紝鍒檟+y+z=243x+2y+z/3=24瑙g瓟寰楋細x=6 y=0 z=18
绛旓細杩欏お澶氭柟娉曚簡鍚 浜旂敺鍥涘コ涓夊皬瀛
绛旓細鍒嗗埆鏄鐢蜂汉涓涓惉浜3鍧銆佸コ浜8涓惉浜16鍧椼佸皬瀛15涓惉浜5鍧
绛旓細璁炬湁x涓敺浜猴紝y涓コ浜锛24-x-y涓皬瀛╋紝鍒楁柟绋嬶細3x+1/2y+1/3锛24-x-y锛=24 18x+3y+48-2x-2y=144 16x+y=96 鐢=6锛屽コ=0锛屽=18