用图象法解方程：3x+6=0 用图像法解方程3x+6=0 急！！！
\u7528\u56fe\u8c61\u6cd5\u89e3\u65b9\u7a0b\uff1a3x+6=0\u5728\u5750\u6807\u7cfb\u4e2d\u5148\u753b\u76f4\u7ebfy=-6\uff0c\u518d\u753b\u76f4\u7ebfY=3X\uff0c\u7136\u540e\u4e24\u8005\u7684\u4ea4\u70b9\u5c31\u662f\u65b9\u7a0b\u7684\u89e3\u3002
\uff08\u6211\u8fd9\u91cc\u6ca1\u529e\u6cd5\u753b\u56fe\uff0c\u53ea\u80fd\u8868\u8ff0\u4e00\u4e0b\u601d\u8def\u4e86\uff09
\u4f60\u662f\u54ea\u4e2a\u5e74\u7ea7\u7684\uff1f
\u8fd9\u4e2a\u9898\u4f53\u73b0\u7684\u662f\u51fd\u6570\u4e0e\u65b9\u7a0b\u7684\u601d\u60f3\uff0c\u8fd9\u5f88\u91cd\u8981\uff0c
y=f(x)\u4e0ey=g(x)\u4e24\u4e2a\u51fd\u6570\u56fe\u8c61\u4ea4\u70b9\u7684\u6a2a\u5750\u6807\u5c31\u662f\u65b9\u7a0bf(x)=g(x)\u7684\u89e3\u3002
\u6240\u4ee5\uff0c\u4f60\u8fd9\u4e2a\u9898\u8981\u5148\u6784\u9020\u4e24\u4e2a\u51fd\u6570\uff08\u6709\u591a\u79cd\u65b9\u6cd5\uff09
\u4ee4y=3x+6,\u8fd9\u662f\u4e00\u4e2a\u4e00\u6b21\u51fd\u6570\uff0c\u4ee4y=0\u8fd9\u662f\u4e00\u4e2a\u5e38\u6570\u51fd\u6570
\u753b\u51fa\u5b83\u4eec\u7684\u56fe\u8c61\uff0c\u627e\u51fa\u4e24\u4e2a\u51fd\u6570\u56fe\u8c61\u7684\u4ea4\u70b9\uff0c\u4e5f\u5c31\u5f97\u5230\u65b9\u7a0b\u7684\u89e3\u4e86
\u6240\u4ee5\u8fc7\u7a0b\u5c31\u662f\uff1a\u6784\u9020\u51fd\u6570\uff0c\u753b\u51fa\u56fe\u8c61\u3002
x＝-2
x=-2
绛旓細鍥炵瓟锛氬湪鍧愭爣绯讳腑鍏堢敾鐩寸嚎y=-6,鍐嶇敾鐩寸嚎Y=3X,鐒跺悗涓よ呯殑浜ょ偣灏辨槸鏂圭▼鐨勮В銆 (鎴戣繖閲屾病鍔炴硶鐢诲浘,鍙兘琛ㄨ堪涓涓嬫濊矾浜)
绛旓細-2
绛旓細鈭村潗鏍囷紙0锛-6锛変负Y=3x-6鍜孻杞寸殑浜ょ偣銆傚皢鍧愭爣锛坸锛0锛変唬鍏=3x-6 寰锛3x-6=0 3x=0+6 x=6/3 鈭祒=2 鈭村潗鏍囷紙2锛0锛変负Y=3x-6涓巟杞寸殑浜ょ偣锛屽緱涓ょ偣杩炴垚涓绾匡紝寰楃嚎娈礩=3x-6銆傜敱姝ゆ柟娉曞緱鍑虹嚎娈祒+Y=4锛岀敾鍑轰袱绾挎鍚庯紝鍙戠幇鍏朵袱绾挎浜ょ偣涓轰袱鏂圭▼瑙銆
绛旓細鍏堝皢涓や釜鏂圭▼鍒嗗埆鍖栫畝锛歽=-x/2 y=-(3/4)*x + 5/4 鐒跺悗鍦ㄥ悓涓鍧愭爣绯讳笅鍒嗗埆鐢诲嚭涓や釜鍑芥暟鐨鍥惧儚 鐒跺悗鍙互鐪嬪嚭涓ょ洿绾夸氦鐐逛负 A锛-1,2锛夋墍浠ユ柟绋嬬粍 鐨勮В涓 x= -1 , y=2
绛旓細杩欏緢閲嶈锛寉=f(x)涓巠=g(x)涓や釜鍑芥暟鍥捐薄浜ょ偣鐨勬í鍧愭爣灏辨槸鏂圭▼f(x)=g(x)鐨勮В銆傛墍浠ワ紝浣犺繖涓瑕佸厛鏋勯犱袱涓嚱鏁帮紙鏈夊绉嶆柟娉曪級浠=3x+6,杩欐槸涓涓竴娆″嚱鏁帮紝浠=0杩欐槸涓涓父鏁板嚱鏁 鐢诲嚭瀹冧滑鐨勫浘璞★紝鎵惧嚭涓や釜鍑芥暟鍥捐薄鐨勪氦鐐癸紝涔熷氨寰楀埌鏂圭▼鐨勮В浜 鎵浠ヨ繃绋嬪氨鏄細鏋勯犲嚱鏁帮紝鐢诲嚭鍥捐薄銆
绛旓細鐢诲嚭鍑芥暟y=-3x+6鐨鍥捐薄锛岀湅瀹冧笌x杞翠氦鐐圭殑妯潗鏍囦究鏄鏂圭▼6-3x=0鐨勮В
绛旓細鐩寸嚎y锛漦x锛媌涓巠杞寸殑浜ょ偣鍧愭爣涓(0锛宐)锛屼笌x杞寸殑浜ょ偣鍧愭爣涓 锛(4)鐢ㄥ嚱鏁拌鐐圭湅鏂圭▼(缁)涓庝笉绛夊紡 鈶犱换浣曚竴鍏冧竴娆℃柟绋嬮兘鍙互杞寲涓篴x锛媌锛0(a锛宐涓哄父鏁帮紝a鈮0)鐨勫舰寮忥紝鎵浠ヨВ涓鍏冧竴娆℃柟绋嬪彲浠ヨ浆鍖栦负锛氫竴娆″嚱鏁皔锛漦x锛媌(k锛宐涓哄父鏁帮紝k鈮0)锛屽綋y锛0鏃讹紝姹傜浉搴旂殑鑷彉閲忕殑鍊硷紝浠鍥捐薄涓婄湅锛...
绛旓細瑙ｏ細锛1锛鏂圭▼缁 锛屸憼脳2+鈶″緱锛10x=21锛寈=2.1鈥︹憿锛屸憿浠ｅ叆鈶犲緱锛6.2+y=8锛寉=1.8锛涙柟绋嬬粍鐨勮В涓 锛涳紙2锛夌敱鍘熸柟绋嬬粍寰楋紝 锛屸埓鍑芥暟鈶犺繃锛0锛岋梗2锛夊拰锛1锛岋梗1锛変袱鐐癸紝鍑芥暟鈶¤繃锛0锛1锛夊拰锛1锛岋梗1锛変袱鐐癸紝涓嬪浘涓哄嚱鏁扳憼銆佲憽鐨鍥捐薄锛屽師鏂圭▼缁勭殑瑙ｄ负 锛涳紙3锛夊師鏂圭▼缁勬暣鐞嗗緱...
绛旓細瑙ｏ細鐢2x+y=1寰梱=锕2x+1锛屽嚱鏁皔=锕2x+1缁忚繃锛0锛1锛夊拰锛 锛0锛夛紝鍥捐薄濡傚浘锛庣敱x锕2y=3寰 锛屽嚱鏁 缁忚繃锛0锛 锛夊拰锛3锛0锛夛紝鍥捐薄濡傚浘锛庣敱鍥惧彲鐭鐐圭殑鍧愭爣鏄細A锛1锛岋梗1锛夛紝鍗鏂圭▼缁 鐨勮В涓 锛
绛旓細瑙ｏ細x=18-3 x=15 5銆佸幓鎷彿锛氳繍鐢ㄥ幓鎷彿娉曞垯锛屽皢鏂圭▼涓殑鎷彿鍘绘帀銆4x+2锛79-x锛=192 瑙ｏ細 4x+158-2x=192 4x-2x+158=192 2x+158=192 2x=192-158 x=17 6銆佸叕寮娉曪細鏈変竴浜涙柟绋嬶紝宸茬粡鐮旂┒鍑鸿В鐨勪竴鑸舰寮忥紝鎴愪负鍥哄畾鐨勫叕寮忥紝鍙互鐩存帴鍒╃敤鍏紡銆傚彲瑙ｇ殑澶氬厓楂樻鐨勬柟绋嬩竴鑸兘鏈夊叕寮忓彲寰7銆...
