各位学霸,这道题解方程怎么做,求解答
\u5b66\u9738\u5e2e\u5e2e\u5fd9\uff0c\u8fd9\u4e24\u9053\u65b9\u7a0b\u600e\u4e48\u89e3\uff0c\u505a\u51fa\u6765\uff01
1,设可以打X折
解:3000X=2000(1+5%) 解得,X=0.7,即7折
绛旓細鍥炵瓟锛1,璁惧彲浠ユ墦X鎶 瑙:3000X=2000(1+5%) 瑙e緱,X=0.7,鍗7鎶
绛旓細1銆佸厛閫氬垎锛屽皢1鏀瑰啓鎴(x+2)/(x+2),鐒跺悗鏂圭▼宸﹁竟杩涜鍔犲噺杩愮畻锛2銆佸鏂圭▼鍙宠竟鐨勫垎姣嶈繘琛屽洜寮忓垎瑙o紝鍗硏²-4=(x+2)(x-2);3銆佸鏂圭▼涓よ竟鍚屾椂涔樹互(x+2)(x-2)锛4銆佹柟绋嬪乏杈圭害鍘(x+2)锛屾柟绋嬪彸杈圭害鍘(x²-4)锛5銆佹暣鐞嗘柟绋嬶紝姹傝В涓鍏冧竴娆℃柟绋嬶紝鏈鍚庡緱鍒皒鐨勮В锛6銆侀獙璇佹墍寰楃殑...
绛旓細鍥炵瓟锛15,6鈥2X+15,6=8,8+15,6 2X=24,4
绛旓細鍥炵瓟锛=4鍒嗕箣10x+10-9鍒嗕箣2x-10=1銆=9(10x+10)-4(2x-10)=36,x=-41鍒嗕箣47
绛旓細鍥炵瓟锛氳В:璁杩欎釜鏁颁负x. 3脳2/3-3/5x=0.4 2-3/5x=0.4 3/5x=1.6 x=1.6梅3/5 x=8/3
绛旓細3.5x=34.15-24 3.5x=10.15 x=10.15闄や互3.5 x=2.9
绛旓細鍥炵瓟锛氳В4x=10鈥2 x=2
绛旓細瑙o細璁捐闄ゆ暟涓簒,闄ゆ暟涓簓 琚櫎鏁/闄ゆ暟=鍟 x/y=2/1 x+y+2/1=2/145 2/3y=2/144 y=48 x=2/1y=2/1*48=24 琚櫎鏁版槸48锛岄櫎鏁版槸24 娓告垙浠g粌---甯崠缃---涓浗缃戠粶娓告垙鏈嶅姟缃
绛旓細瑕佹眰椹村瓙鍘熸潵鎵鎵樿揣鐗╃殑琚嬫暟锛屽氨瑕佸厛璁惧嚭鏈煡鏁帮紝鍐嶉氳繃鐞嗚В棰樻剰鍙煡鏈鐨勭瓑閲忓叧绯伙紝鍗抽┐瀛愬噺鍘讳竴琚嬫椂鐨勪袱鍊嶅噺1锛堝嵆楠″瓙鍘熸潵椹殑琚嬫暟锛夊啀鍑1锛堟垜缁欎綘涓琚嬶紝鎴戜滑鎵嶆伆濂介┊鐨勪竴鏍峰锛=椹村瓙鍘熸潵鎵鎵樿揣鐗╃殑琚嬫暟鍔犱笂1锛屾牴鎹杩欎釜绛夐噺鍏崇郴鍒鏂圭▼姹傝В锛庤В锛氳椹村瓙鍘熸潵椹畑琚嬶紝鍒欏緱鍒版柟绋嬶細2锛坸-1锛-1-1...
绛旓細x-2x/5=15;3x/5=15;x=25;鏈夊府鍔╄寰楀ソ璇勶紝鏂伴棶棰樿閲嶆柊鍙戝笘鎻愰棶锛岃繖閲屼笉鍐嶅洖绛旇阿璋