写出过程:甲乙两数的比是4:5乙丙两个数的比是3:4,那么甲数:丙数=( ):( ) 甲乙两数的比是5:4,乙丙两数的比是3:2,乙数是48,甲数...
\u7532\u4e59\u4e24\u6570\u7684\u6bd4\u662f4\uff1a5\uff0c\u4e59\u4e19\u4e24\u6570\u7684\u6bd4\u662f3\uff1a4\uff0c\u7532\uff1a\u4e59\uff1a\u4e19\uff1d\uff08\uff09\uff1a\uff08\uff09\uff1a\uff08\uff09\u3002=12\uff1a15\uff1a20
\u4e59\u6570\u662f48\uff0c\u7532\u4e59\u4e24\u6570\u7684\u6bd4\u662f5*12/4*12\u6240\u4ee5\u7532\u6570\u4e3a60
\u4e59\u4e19\u4e24\u6570\u7684\u6bd4\u662f3*16/2*16\uff0c\u6240\u4ee5\u4e19\u6570\u4e3a32
绛旓細鎶婄敳鏁扮湅鍋4锛屼箼鏁扮湅鍋5銆傜敳鏁版槸涔鏁扮殑4/5锛4+5=9锛屼箼鏁版槸鐢蹭箼涓ゆ暟鍜岀殑5/9銆
绛旓細鎮ㄥソ锛佽鐢蹭负x 涔欎负y 鍒欐湁 x:y=4:5 y-x=2/5 鍒 x=y-0.4锛屽甫鍏 x:y=4:5 瑙e緱锛歽=2 鎵浠ヤ箼鏁颁负锛2 鏈涙偍閲囩撼锛岃阿璋㈡偍鐨勬敮鎸侊紒
绛旓細鐢54脳4/锛4+5锛=24 涔54脳5/锛4+5锛=30
绛旓細鐢诧細涔=4:5 璇存槑鐢叉槸涔欑殑4/5 閭d箞鐢叉瘮涔欏皯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
绛旓細鐢浜鍑鍥绛変簬涓锛岀劧鍚庣敤1闄や互5涔樹笂鐧惧垎涔嬬櫨锛屽緱鏁版槸20% 锛岃繖鏍峰彲浠ュ緱鍑虹敳鏁版瘮宸叉暟灏20 鐢ㄤ簲鍑忓洓绛変簬涓锛岀劧鍚庣敤1闄や互4涔樹笂鐧惧垎涔嬬櫨锛屽緱鏁版槸25% 锛岃繖鏍峰彲浠ュ緱鍑虹敳鏁版瘮宸叉暟澶25
绛旓細4/5=5鍒嗕箣4 锛堢敳鏁版槸涔鏁扮殑5鍒嗕箣4锛5+4=9 5/9=9鍒嗕箣5锛堜箼鏁版槸鐢蹭箼涓ゆ暟鍜岀殑9鍒嗕箣5锛夋湜閲囩撼锛岃阿璋
绛旓細6锛氫箼=4锛5 鍐呴」鐩镐箻绛変簬澶栭」鐩镐箻 涔=6x5/4 涔=7.5
绛旓細1/5 1/4
绛旓細鐢蹭箼涓ゆ暟鐨勬瘮鏄4:5锛岀敳鏁版槸涔欐暟鐨勶紙4/5 锛変箼鏁版槸鐢茬啛鐨勶紙 5/4锛夛紝鐢叉暟鏄袱涓暟鐨勫拰锛4/9 锛夛紝鐢鏁版瘮涔欐暟灏1/5 銆傜敳涔欎袱鏁扮殑姣2:5鐢叉暟鍗犱袱鏁板樊鐨2/3锛 涔欐暟姣旂敳鏁板3/2
绛旓細4梅5=80 5梅4=125 绛锛氱敳鏁版槸涔鏁扮殑80%锛屼箼鏁版槸鐢叉暟鐨125%锛庢晠閫夛細鈶犮佲憿锛