甲数的5分之2与乙数的4分之1相等,则甲数是乙数的几分之几?
\u7532\u6570\u76842/5\u4e0e\u4e59\u6570\u76844/7\u76f8\u7b49\uff0c\u7532\u6570\u662f\u4e59\u6570\u7684\u51e0\u5206\u4e4b\u51e0\uff1f\u8bf7\u5199\u8ba1\u7b97\u8fc7\u7a0b\u3002\u8c22\u8c22\u7531\u9898\u610f\uff1a2/5\u7532\uff1d4/7\u4e59
\u6240\u4ee5\uff1a\u7532/\u4e59\uff1d4/7\uff0a5/2\uff1d10/7
\u7532\u6570\u662f\u4e59\u6570\u7684
=3\u5206\u4e4b2\u00f75\u5206\u4e4b4
=12\u5206\u4e4b10
=6\u5206\u4e4b5
~\u4e00\u523b\u6c38\u8fdc523\u4e3a\u4f60\u89e3\u7b54\uff0c\u795d\u4f60\u5b66\u4e60\u8fdb\u6b65~~~
~\u5982\u679c\u4f60\u8ba4\u53ef\u6211\u7684\u56de\u7b54\uff0c\u8bf7\u53ca\u65f6\u70b9\u51fb\u3010\u91c7\u7eb3\u4e3a\u6ee1\u610f\u56de\u7b54\u3011\u6309\u94ae~
~\u624b\u673a\u63d0\u95ee\u8005\u5728\u5ba2\u6237\u7aef\u53f3\u4e0a\u89d2\u8bc4\u4ef7\u70b9\u201c\u6ee1\u610f\u201d\u5373\u53ef\u3002
~\u4f60\u7684\u91c7\u7eb3\u662f\u6211\u524d\u8fdb\u7684\u52a8\u529b~~
~\u5982\u8fd8\u6709\u65b0\u7684\u95ee\u9898\uff0c\u8bf7\u53e6\u5916\u5411\u6211\u6c42\u52a9\uff0c\u7b54\u9898\u4e0d\u6613\uff0c\u656c\u8bf7\u8c05\u89e3~~
甲数=乙数×(1/4)×(5/2)
=乙数×(5/8)
则甲数是乙数的8分之5
绛旓細鐢叉暟涓庝箼鏁扮殑鏈绠鏁存暟姣旀槸锛1/4:2/5=5:8
绛旓細宸槸3 瑙ｏ細鐢诧細涔=4鍒嗕箣1锛5鍒嗕箣2=5锛8 鍥犱负鐢插拰涔閮芥槸涓浣嶆暟锛屾墍浠ョ敳鏄5锛屼箼鏄8 浜岃呯殑宸槸8-5=3
绛旓細鍚т箼鐪嬩负鍗曚綅1,涔欐暟鐨勫洓鍒嗕箣涓涓1/4 閭ｄ箞锛氱敳=1/4梅2/5=5/8 鐢诧細涔=5/8锛1=5:8
绛旓細璁剧敳涓簒,涔涓簓 0.4x = 0.25y x = 0.25y / 0.4 =0.625y => x = 0.625y 鑻 x = 1 鍙緱鐭 y涓 =1.6 鑻 y 涓 1 鍒 x =0.625 1 - 0.625 =0.375 * 100% = 37.5 寰楃煡 鐢插皯鏂间箼 涓37.5
绛旓細鐢叉暟鐨勪簲鍒嗕箣浜鏄涔欐暟鐨勫洓鍒嗕箣涓锛屽垯鐢蹭箼姣旀槸锛 ),涔欐暟鏄敳鏁扮殑鍑犲 2/5鐢=1/4涔=鐢诧細涔=5锛8 涔欐暟鏄敳鏁扮殑5/8鍊
绛旓細瑙ｏ細鐢茬殑2/5=涔鐨1/4 閭ｄ箞锛氱敳锛氫箼=1/4:2/5 =(1/4*20):(2/5*20)=5:8 绛旓細
绛旓細5/8 瑙ｉ鎬濊矾,鐢遍鎰忓彲鐭ワ細鐢*2/5=涔*1/4 ,鏍规嵁姣斾緥涓ゅ唴椤圭殑绉瓑浜庝袱澶栭」鐨勭Н鍒楀紡锛氱敳锛氫箼=1/4:2/5 =5/8 鎵浠,鐢叉暟鏄涔欐暟鐨5/8
绛旓細2/5:1/4=2/5*20:1/4*20=8:5
绛旓細2/5脳鐢 = 1/4脳涔 鐢诧細涔 = 1/4 : 2/5 = 5:8 璇存槑鐢叉槸5浠芥暟锛屼箼鏄8浠芥暟 鐒跺悗鎸夋潯浠舵墿澶у氨琛屼簡锛屽锛氬綋鐢诧紳5脳2=10鏃讹紝 涔欙紳8脳2=16 褰撶敳锛5脳3=15鏃讹紝 涔欙紳8脳3=24 褰撶敳锛5脳4=20鏃讹紝 涔欙紳8脳4=32 鈥︹﹀綋鐢诧紳5脳12=60鏃讹紝 涔欙紳8脳12=96 锛堟渶澶х殑涓...
绛旓細閿欒銆鐢叉暟鐨40%涓庝箼鏁扮殑25%鐩哥瓑锛岃鏄庝箼鏁版洿澶с傛墍浠ュ師鍛介閿欒銆傘愭暟瀛︿箣缇庛戝洟涓烘偍瑙ｇ瓟锛屾弧鎰忚閲囩撼锛屼笉鏄庣櫧璇疯拷闂紝绁濆涔犺繘姝(鈭鈭)O~~
