一直角梯形的下底比上底长2厘米，高比上底短1厘米，面积是8平方厘米，画出这个梯形 一直角梯形，下底比上底大2厘米，高比上底小1厘米，面积8平方...
\u4e00\u4e2a\u76f4\u89d2\u68af\u5f62\u7684\u4e0b\u5e95\u6bd4\u4e0a\u5e95\u957f2\u5398\u7c73\uff0c\u9ad8\u6bd4\u4e0a\u5e95\u77ed1\u5398\u7c73\uff0c\u9762\u79ef\u662f8\u5e73\u65b9\u5398\u7c73\u8bbe\u4e0a\u5e95\u4e3aX\uff0c\u5219\u4e0b\u5e95\u4e3aX+2\uff0c\u9ad8\u4e3aX-1\u3002
[X+\uff08X+2\uff09]\u00d7\uff08X-1\uff09\u00f72=8
\uff082X+2\uff09\uff09\u00d7\uff08X-1\uff09=16
2X^2=18
X=3\u5398\u7c73
\u5219\u4e0b\u5e95\u4e3a:3+2=5\u5398\u7c73\uff0c
S\u68af\u5f62=\uff08\u4e0a\u5e95+\u4e0b\u5e95\uff09\u00d7\u9ad8\u00f72 \u8bbe\u4e0a\u5e95\u4e3aX\u5398\u7c73 \uff08X+2+X\uff09\u00d7\uff08X\uff0d1)\u00f72=8 X=3 \u2234\u4e0a\u5e953\u5398\u7c73\uff0c\u4e0b\u5e955\u5398\u7c73\uff0c\u9ad82\u5398\u7c73\u3002
绛旓細濡備笅鍥撅細3+9=12锛鍘樼背锛夌瓟锛氱洿瑙掍笁瑙掑舰鐨勫懆闀挎槸12鍘樼背銆傘愯В鏋愩戞湰棰樿冩煡鐨勬槸涓夎褰㈢殑鍛ㄩ暱銆備笁瑙掑舰鍛ㄩ暱=涓夎竟涔嬪拰銆傜敱鍥惧彲鐭ュ皢鐩磋姊舰鍒掑垎鎴愪簡涓涓钩琛屽洓杈瑰舰鍜屼竴涓洿瑙掍笁瑙掑舰锛鐩磋姊舰鐨勪笅搴曟瘮涓婂簳闀3鍘樼背锛屼袱鑵颁箣鍜屾槸9鍘樼背锛屾牴鎹钩琛屽洓杈瑰舰瀵硅竟鐩哥瓑鐨勬ц川锛屽彲寰椾笁瑙掑舰鐨勫簳杈逛负鐩磋姊舰涓嬪簳姣...
绛旓細鎬濊矾锛氫笅搴曟槸涓婂簳鐨3鍊嶏紝鍒欒鏄涓嬪簳姣斾笂搴曢暱2鍊 灏嗕笂搴曞欢闀10鍘樼背寰楀埌姝ｆ柟褰紝鍒欒鏄庯細1銆佷笅搴曟瘮涓婂簳闀10鍘樼背锛2銆姊舰楂樹笌涓嬪簳涓鏍烽暱 鍏蜂綋鍋氭硶锛氫笂搴曪細10/锛3锛1锛夛紳5鍘樼背 涓嬪簳锛3*5锛15鍘樼背 鍘熸褰㈤潰绉細锛5锛15锛*15/2锛150骞虫柟鍘樼背 ...
绛旓細鐩磋姊舰涓婂簳姣斾笅搴曢暱涓鍘樼背锛屼袱鑵颁箣鍜屾槸涔濆帢绫筹紝灏嗙洿瑙掓褰㈠垎鎴愪竴涓钩琛屽洓杈瑰舰鍜屼笁瑙掑舰锛屼笁瑙掑舰鐨勫懆闀挎槸12鍘樼背銆傛牴鎹鎰忚绠楋細鐩磋姊舰鐨勪笂搴曟瘮涓嬪簳闀涓夊帢绫筹紝鍗崇洿瑙掍笁瑙掑舰鐨勪竴鏉＄洿瑙掕竟涓3鍘樼背锛涗袱鑵颁箣鍜屾槸涔濆帢绫筹紝鍒欑洿瑙掍笁瑙掑舰鐨勫彟涓鏉＄洿瑙掕竟涓庢枩杈逛箣鍜屼负9鍘樼背銆備笁瑙掑舰鐨勫懆闀匡細3+9=12锛堝帢绫...
绛旓細濡傚浘鎵绀猴細鍋囪涓婂簳鐨勯暱搴︽槸2鍘樼背锛屽垯楂樻槸2鍘樼背锛屽簳鏄4鍘樼背锛屾妸涓婂簳骞冲潎鍒嗘垚2浠斤紝涓嬪簳骞冲潎鍒嗘垚4浠斤紝姣忎唤鏄1鍘樼背锛岄珮鏄2鍘樼背锛屾渶宸﹂潰涓夎褰㈢殑闈㈢Н鏄細1脳2梅2=1锛堝钩鏂瑰帢绫筹級锛涙渶鍙宠竟鐨勪笁瑙掑舰闈㈢Н涓猴細2脳2梅2=2锛堝钩鏂瑰帢绫筹級锛屼腑闂翠笁瑙掑舰鐨勯潰绉槸锛2脳3梅2=3锛堝钩鏂瑰帢绫筹級锛屽垯涓夐儴鍒嗙殑闈㈢Н姣...
绛旓細鐩磋姊舰鐨勪笅搴曟瘮涓婂簳闀3鍘樼背,涓婂簳闀夸负6鍘樼背,涓よ叞涔嬪拰鏄9鍘樼背.鍒欑洿瑙掓褰㈢殑鍛ㄩ暱鏄灏戝帢绫?6+(6+3)+9=24,鐩磋姊舰鐨勫懆闀挎槸24鍘樼背.
绛旓細梅6脳1 锛1cm 绗簩涓簳杈 涓婂簳+涓嬪簳锛2+4锛壝6脳2锛2cm 绗笁涓簳杈 锛2+4锛壝6脳3 锛3cm 鎶婁笂搴曚綔涓轰竴涓柍鐨勫簳杈癸紝鎶婁笅搴曞垎涓3cm鍜1cm鍒嗗埆浣滀负2涓柍鐨勫簳杈 楠岃瘉锛 鈻抽潰绉 鍒嗗埆鏄簳杈姑梙梅2 锛1h梅2锛夛細锛2h梅2锛 锛3h梅2锛夛紳1锛2锛3 ...
绛旓細涓嬪簳姣斾笂搴曢暱涓鍒嗙背锛屾墍浠ヤ笂搴曟瘮涓嬪簳鐭袱鍒嗙背锛屼笂搴曚负鍏噺浜岀瓑浜庡叚鍒嗙背锛岄珮绛変簬涓婂簳浜︿负鍏垎绫筹紝姊舰闈㈢Н涓轰笂搴曞姞涓嬪簳涔樹互楂橀櫎浠ヤ簩绛変簬鍥涘崄浜
绛旓細瑙ｇ瓟锛氬皬鍒氱殑璇存硶鏄鐨勩傜悊鐢憋細鐩磋姊舰鐨勫彟涓鏉¤叞涓虹嚎娈礑EDC涓鸿繃鐐笵鍚戠嚎娈礏C浣滅殑鍨傜洿绾挎锛屽張鍥犱负浠庣洿绾垮涓鐐瑰埌杩欐潯鐩寸嚎鎵鐢荤殑鍨傜洿绾挎鏈鐭紝鎵浠ョ嚎娈礑E涓瀹氭瘮绾挎DC闀,涔熷氨鏄竴瀹姣2鍘樼背闀裤(绛旀鍚堢悊鍗冲彲)鐩磋姊舰闈㈢Н璁＄畻锛氬凡鐭鐩磋姊舰鐨勪笂搴涓篴锛涓嬪簳涓篵锛岄珮涓篽锛屾枩杈逛负d銆傛牴鎹洿瑙掓褰㈢殑...
绛旓細璁涓嬪簳涓篨锛涓婂簳鏄3X/5, X+2=3X/5+14 X=30 涓婂簳鏄18锛岄珮鍒欐槸30+2=32 S=锛18+30锛塜32梅2=768 瀹屾垚锛岃閲囩撼
绛旓細(6)涓涓鐩磋姊舰,涓婂簳鍜涓嬪簳鐨姣旀槸5:2,濡傛灉涓婂簳寤堕暱2绫,涓嬪簳寤堕暱8绫,鍙樻垚涓涓鏂瑰舰,姹傚師鏉姊舰鐨闈㈢Н? (7)鐢蹭箼涓ら槦鐨勪汉鏁扮殑姣旀槸7:8,濡傛灉浠庣敳闃熸淳30浜哄幓涔欓槦,閭ｄ箞鐢蹭箼涓ら槦浜烘暟鐨勬瘮鏄2:3銆傜敳涔涓闃熷師鏉ュ悇鏈夊灏戜汉? (8)涓杈嗚揣杞︿粠鍘垮煄寰灞遍噷杩愯揣,寰杩斿叡璧20灏忔椂,鍘绘椂鎵鐢ㄦ椂闂存槸鍥炴潵鏃剁殑1.5鍊,...
