甲数比乙数多五分之一,甲数是甲乙两数之和的百分之几?列算式
解:令乙数为1,则甲数为1+1/5=6/56/5÷(1+6/5)
=6/5÷11/5
=6/11
=0.545
=54.5%
甲数比乙数多五分之一 甲-乙/乙=1/5 化简 5甲-5乙=乙 5甲=6乙 ①
甲数是甲乙两数之和的百分之几?列算式 甲/(甲+乙)= 5甲/(5甲+5乙)②
①代入② =6乙/11乙 =6/11 百分比自己算
求采纳
绛旓細鐢叉暟鏄5锛涔欐暟鏄8.锛8-5锛/5x100 =3/5x100 =0.6x100 =60 涔欐暟姣旂敳鏁板60 锛8-5锛/8x100 =3/8x100 =0.375x100 =37.5 鐢叉暟姣斾箼鏁灏37.5
绛旓細浣犲ソ锛鐢叉暟姣斾箼鏁板浜斿垎涔嬩竴,鐢叉暟鐩稿綋浜庝箼鏁扮殑锛 5鍒嗕箣6 锛夛紙濉垎鏁帮級涔欐暟鐪嬪仛1,鐢叉暟灏辨槸1+5鍒嗕箣1=5鍒嗕箣6 鎵浠,鐢叉暟鐩稿綋浜庝箼鏁扮殑5鍒嗕箣6
绛旓細瀵.璁涔欐暟涓篨,鐢叉暟澶1/5灏辨槸6/5X 閭d箞,鐢叉暟灏辨槸涔欐暟鐨6/5X闄や互X,灏辨槸6/5
绛旓細鐢叉暟姣斾箼鏁板浜斿垎涔嬩竴锛岀敳鏁鐩稿綋浜庝箼鏁扮殑锛 6/5 锛夛紝涔欐暟鐩稿綋浜庣敳鏁扮殑锛 5/6 锛変緥濡傦紝涔欎负1锛屽垯鐢蹭负1.2锛鐢叉槸涔欑殑6/5,涔鏄敳鐨5/6
绛旓細鐢叉暟姣斾箼鏁板浜斿垎涔嬩竴,鍒欑敳鏁板氨鏄箼鏁扮殑浜斿垎涔嬪叚,閭d箞涔欐暟灏鏄敳鏁鐨勫叚鍒嗕箣浜,鎵浠ヤ箼鏁版瘮鐢叉暟灏戝叚鍒嗕箣涓.
绛旓細鐢叉暟姣斾箼鏁板5鍒嗕箣涓锛岀敳鏁版槸6.涔欐暟=6梅锛1锛1锛5锛夛紳6脳5锛6锛5锛岀瓟锛氫箼鏁版槸锛 5锛
绛旓細璁句箼鏁版槸1锛屽垯鐢叉暟(1+1/5)=6/5锛屾墍浠涔欐暟姣旂敳鏁灏戯細(6/5-1)梅(6/5)=1/6銆備箼鏁版槸鐢蹭箼鏁板拰鐨勶細1梅(6/5+1)=1梅(11/5)=5/11銆鐢叉暟鏄敳涔骞冲潎鏁扮殑锛6/5梅锛(6/5+1)梅2锛=6/5脳10/11=12/11銆
绛旓細鐢叉暟姣斾箼鏁板浜斿垎涔嬩竴,鐢叉暟涓庝箼鏁扮殑姣旀槸(6:5),濡傛灉鐢叉暟鏄60,閭d箞涔欐暟鏄(50)
绛旓細涔欐暟鏄25銆30梅锛1+1/5锛=30梅6/5 =25 鐢叉暟鏄36銆30脳锛1+1/5锛=30脳6/5 =36 鍒嗘瀽锛鐢叉暟姣斾箼鏁板1/5锛屸滄瘮鈥濆悗闈㈢殑閲忕湅鎴愬崟浣1锛岃鏄庣敳鏁版槸涔欐暟鐨浜斿垎涔鍏紝鎹㈠彞璇濊 涔欐暟脳6/5=30锛屽氨姹備箼鏁板氨鐢 30梅6/5 銆傛眰褰撲箼=30锛屾眰鐢叉暟灏辩敤 30脳6/5=36 甯屾湜甯埌浣狅紒
绛旓細鐢叉暟姣斾箼鏁板浜斿垎涔嬩竴锛鍒欑敳鏁板氨鏄箼鏁扮殑浜斿垎涔嬪叚锛岄偅涔堜箼鏁板氨鏄敳鏁鐨勫叚鍒嗕箣浜旓紝鎵浠ヤ箼鏁版瘮鐢叉暟灏戝叚鍒嗕箣涓銆