数学堂堂练
\u6570\u5b66\u5802\u5802\u7ec31\u300160\u00d740%\u00d715%+60\u00d7(1-40%)\u00d712%
2\u30014970/(1+14%)
3\u300148\u00d724000\u00d78%
\u5e02\u9762\u4e0a\u6709\u5356\u7684\uff0c\u4e0d\u8fc7\u6211\u529d\u4f60\u522b\u53bb\u6284\uff0c\u90a3\u7b54\u6848\u6b63\u786e\u7387\u5f88\u4f4e\u7684\uff0c\u6211\u4e5f\u6284\u8fc7\uff0c\u7ed3\u679c\u88ab\u8001\u5e08\u5927\u9a82\u4e00\u987f\u3002
5600/(1-0.2)=5600/0.8=7000（元）5600/0.8=7000
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绛旓細8銆佸晢搴楁湁绾㈡皵鐞冨拰榛勬皵鐞冨叡360涓紝绾㈡皵鐞冨崠鍑虹櫨鍒嗕箣浜屽崄浜旓紝榛勬皵鐞冨崠鍑24涓紝鍓╀笅鐨勭孩姘旂悆鍜岄粍姘旂悆姝ｅソ鐩哥瓑锛屽師鏉ョ孩姘旂悆鍜岄粍姹界悆鍚勬湁澶氬皯锛熻В锛氬崠鍑洪粍姹界悆24涓紝杩樺墿涓360-24=336涓 姝ゆ椂灏嗛粍姹界悆鐪嬩綔鍗曚綅1锛岄偅涔堢孩姘旂悆鏈1/锛1-25%锛=4/3 鍘熸潵榛勬苯鐞冩湁24+336/(1+4/3)=24+144=168涓 鍘熸潵绾...
绛旓細璁惧効瀛愬幓骞磝宀侊紝鐖朵翰鍘诲勾y宀 鍘诲勾锛歽锛6x 锛 浠婂勾锛歽锛20锛2锛坸锛20锛夈愬姞20鏄洜涓10骞村墠鍜屽崄骞村悗鍙20骞淬戞妸y锛6x甯﹀叆 y锛20锛2锛坸锛20锛6x锛20锛2x锛40 4x锛20 x锛5 鍥犱负璁剧殑鏄幓骞寸殑 鎵浠ヨ涔6鍊嶏細5 X 6锛30锛堢埗浜茬殑骞撮緞锛夎繖30鏄埗浜蹭粖骞寸殑锛屼粖骞寸埗浜叉瘮鍎垮瓙澶2鍊嶆墍浠ワ細30 ...
绛旓細棣栧厛绾犳涓鐐癸細濡傛灉鎴戞病鏈夌寽閿欑殑璇濓紝浣犳妸棰樼洰鎵撻敊浜嗭細ax-by-2x=13搴旇鏄痑x-by-2z=13.灏唜=3銆亂=-1銆亃=-2浠ｅ叆鏂圭▼缁刟x-by-2z=13銆乤x+2y+cz=-2銆乧x-4y+bz=28寰 鏂扮殑鏂圭▼缁勶細3a+b+4=13,3a-2-2c=-2,3c+4-2b=28.鏈缁堣В寰梐=4,b=-3,c=6.濡傛灉浣犳病鏈夋墦閿欓锛岄偅浣犳寜鐓ц繖绉...
绛旓細1.鏃犳暟锛岀粡杩囧渾蹇 2.鍦嗗績锛岀洿寰 3.鐩村緞 4.2 5.鐩稿悓 6.3 7.鍦嗗懆鐜 8. 12.56 9.b 10.c 11.b 12. b 13. 3.14脳6=18.84cm 18.84脳10=188.4cm 绛旓細鍓嚭鐨勫渾鐨勫懆闀挎槸188.4cm銆14. 6.28梅2=3.14 3.14梅3.14=1 绛旓細鍦嗙殑鐩村緞...
绛旓細1. 3.14*2梅2+2=5.14 锛堣繖鏄皝闂紡鐨勫崐鍦嗭級3.14*2梅2=3.14锛堣繖鏄病鏈夊皝闂殑鍗婂渾锛夊崐鍦嗙殑鍛ㄩ暱鍏紡 灏侀棴寮 蟺d梅2+d 涓嶅皝闂d梅2 2. 6.28*4梅3,14梅2=4 3.寮ч暱鏄繖涓渾鍛ㄩ暱鐨勶紙1/4锛/2=1/8
绛旓細1 鍥犱负涓夎褰袱杈逛箣鍜屽ぇ浜庣涓夎竟锛屾墍浠7+3X>4X锛屽仛鍑烘潵X<7 杩樻湁涓涓儏鍐碉紝3X+4X>7锛屽仛鍑烘潵X>1 鎵浠1<X<7 2 鑻7鏄叞锛3X鏄簳杈癸紝4X鏄彟澶栦竴涓叞 鍒橷=7/4 鑻7鏄叞锛4X鏄簳杈癸紝3X鏄彟澶栦竴涓叞锛屽垯X=7/3 鑻7鏄簳杈癸紝3X銆4X鏄袱鏉¤叞锛屽垯3X=4X锛屼絾鏄棤瑙ｏ紝鎵浠ヨ垗鍘 鎵浠=7/4鎴...
绛旓細璁剧敳鍘傚師璁″垝鐢熶骇x鍚紱涔欏巶鐢熶骇鍘熻鍒抷鍚紱鍒 x+y=4000-400 锛1锛120%x+100%y=4000 锛2锛墄=2000鍚紱y=1600鍚ㄣ
绛旓細8*6+8*3*2+6*3*2-8=124锛堝钩鏂圭背锛
绛旓細鍥犵粷瀵瑰煎ぇ浜庣瓑浜0锛屽钩鏂逛害澶т簬绛変簬0锛屼簩鑰呯浉鍔犲ぇ浜庣瓑浜0锛屽洜鐩稿姞灏忎簬绛変簬0锛屾晠鍘熷紡绛変簬0锛屾晠3a-b+1=2a+3b-35=0姹傚嚭a=11鍒嗕箣32 b=11鍒嗕箣107銆
