甲乙两数之比是4:5,则甲比乙少( )A.1B.20%C.25
\u7532\u4e59\u4e24\u6570\u4e4b\u6bd4\u662f4\uff1a5\uff0c\u5219\u7532\u6bd4\u4e59\u5c11\uff08\u3000\u3000\uff09 A\uff0e1 B\uff0e20% C\uff0e25\u8bbe\u7532\u6570\u662f4\uff0c\u90a3\u4e48\u4e59\u6570\u5c31\u662f5\uff1b\uff085-4\uff09\u00f75\uff0c=1\u00f75\uff0c=20%\uff1b\u7b54\uff1a\u7532\u6bd4\u4e59\u5c1120%\uff0e\u6545\u9009\uff1aB\uff0e
\uff085-4\uff09\u00f74\uff0c=1\u00f74\uff0c=25%\uff1b\u7b54\uff1a\u7532\u6570\u6bd4\u4e59\u6570\u591a25%\uff0e\u6545\u9009\uff1aB\uff0e
设甲数是4,那么乙数就是5;(5-4)÷5,
=1÷5,
=20%;
答:甲比乙少20%.
故选:B.
绛旓細璁鐢叉暟鏄4锛岄偅涔涔欐暟灏辨槸5锛涳紙5-4锛壝5锛=1梅5锛=20%锛涚瓟锛氱敳姣斾箼灏20%锛庢晠閫夛細B锛
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绛旓細瑙o細宸茬煡鐢蹭箼涓ゆ暟姣旀槸4锛5锛屽嵆鐢叉暟鏄箼鏁扮殑4/5锛岋紙涔欐暟鏄崟浣嶁1鈥濓級锛岄偅涔堢敳鏁版瘮涔欐暟灏戯細1-4/5=1/5 绛旓細鐢叉暟姣斾箼鏁板皯1/5銆
绛旓細鐢叉瘮涔灏:(5-4)梅5=20 涔欐瘮鐢插:(5-4)梅4=25
绛旓細鐢诧細涔=4:5 璇存槑鐢叉槸涔欑殑4/5 閭d箞鐢叉瘮涔灏1/5 涔欐瘮鐢插1/4 鐢叉瘮涔欏皯锛1/5 锛,涔欐瘮鐢插锛 1/4锛
绛旓細鐢蹭箼涓ゆ暟姣旀槸4锛5锛鎶鐢叉暟鐪嬫垚4锛涔欐暟灏辨槸5锛4梅5=80%锛5-4=1锛1梅5=20%锛1梅4=25%锛涚瓟锛鐢叉槸涔欑殑 80% 鐢叉瘮涔灏 20%锛屼箼姣旂敳澶 25%锛庢晠绛旀涓猴細80锛20锛25锛庣偣璇勶細鏈鏄眰涓涓暟鏄彟涓涓暟鐨勭櫨鍒嗕箣鍑狅紝鍏抽敭鏄湅鎶婅皝褰撴垚浜嗗崟浣嶁1鈥濓紝鍗曚綅鈥1鈥濈殑閲忎负闄ゆ暟锛
绛旓細锛5-4锛壝5=1梅5=0.2=20%锛5-4锛壝4=1梅4=0.25=25%绛锛氱敳姣斾箼灏20%锛屼箼姣旂敳澶25%銆
绛旓細鐢鏁版槸涔欐暟鐨5/4锛岀敳鏁版瘮涔鏁板1/4锛屼箼鏁版瘮鐢鏁板皯1/5.
绛旓細(5-4)梅5脳100%=20%,鐢叉瘮涔灏戠櫨鍒嗕箣20锛(5-4)梅4脳100%=25%,涔欐瘮鐢插鐧惧垎涔25