新人教版七年级数学上册习题3.3第五题
\u4eba\u6559\u7248\u4e03\u5e74\u7ea7\u4e0a\u518c\u6570\u5b664.3\u548c4\u7684\u4e60\u9898\u7b54\u68481\u30016\u5c0f\u65f6\uff0c12\u5c0f\u65f6\u3002
3\u3001(1)116\u00b010\u2032\uff082\uff09106\u00b025\u2032
4\u3001= >
5\u3001\u90fd\u7b49\u4e8e62\u00b0
6\u3001<AOC,<AOD,<BOC,<BOD
7\u5ef6\u957fAO\u6216BO\uff0c\u5148\u6d4b\u91cf\u89d2AOB\u7684\u8865\u89d2\uff0c\u518d\u8ba1\u7b97\u89d2AOB\u7684\u5927\u5c0f
10\u300170\u00b0\u300140\u00b0
1124\u00b0\u300116\u00b022\u2032
13\uff081\uff0945\u00b0\uff0c\uff082)90\u00b0
14\u53e6\u5916\u4e00\u4e2a\u89d2\u90fd\u7b49\u4e8e135\u00b0\uff0c\u56db\u8fb9\u5f62\u5185\u89d2\u548c360\u00b0\u3002
15\uff081\uff09\u8fd9\u4e9b\u548c\u90fd\u7b49\u4e8e360\u00b0\uff082\uff09\u8fd9\u4e9b\u548c\u90fd\u7b49\u4e8e360\u00b0\uff0c\u731c\u60f3\u591a\u8fb9\u5f62\u5916\u89d2\u548c360\u5ea6
1\u3001\uff081\uff09\u3001 = 9x=18
9x\u9664\u4ee59=18\u9664\u4ee59
x=2
\uff082\uff09\u3001 = -1x=-3
-1x\u9664\u4ee5-1=-3\u9664\u4ee5-1
x=3
\uff083\uff09\u3001 = 6.5y=-6.5
6.5y\u9664\u4ee56.5=-6.5\u9664\u4ee56.5
x=-1
\uff084\uff09\u3001 = 6\u5206\u4e4b5b=3
6\u5206\u4e4b5b\u9664\u4ee56\u5206\u4e4b5=3\u9664\u4ee56\u5206\u4e4b5
b=5\u5206\u4e4b18
（2）15x=10（30+x） 解得：x=60
（3）山高：15×60=900米
绛旓細銆愮瓟妗堛戯細 1•瑙ｏ細(1)a+5=8锛(2)1/3b=9锛(3)2x+10=18; (4)1/3x-y=6;(5)3a+5=4a; (6)1/2b-7=a+b.2锛庤В锛(1)a+b=b+a锛(2)a锛巄=b锛巃锛(3)a锛(b+c)=a锛巄+a锛巆锛(4)锛坅+b锛+c=a+(b+c)锛3.瑙ｏ細x=3鏄柟绋(3)3x-2=4+x鐨勮В锛嶺=0鏄柟绋(1...
绛旓細锛1锛10锛30+x锛/15灏辨槸鏉庢槑鐧诲北鐨勬椂闂淬傦紙2锛15x=10锛30+x锛 瑙ｅ緱锛歺=60 锛3锛夊北楂橈細15脳60=900绫
绛旓細y= 44 绗叚棰.瑙ｏ細璁剧數姘旀満杞︾殑閫熷害涓簒鍗冪背/鏃讹紝鍒欑鎮诞鍒楄溅鐨勯熷害涓猴紙5x+20)鍗冪背/鏃 0.5x+0.5脳锛5x+20锛=298 瑙ｅ緱.x=96 . 鍒5x+20=500 绛旓細鐢垫皵鏈鸿溅鐨勯熷害涓96鍗冪背/鏃讹紝纾佹偓娴垪杞﹂熷害涓500鍗冪背/鏃 绗涓冮 瑙ｏ細璁炬棤椋庢椂椋炴満鐨勮埅閫熶负x鍗冪背/鏃 锛24+x锛壝 17/6=锛坸-24锛壝...
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绛旓細涓冨勾绾т笂鍐屼汉鏁欑増鏁板璇炬湰绛旀濡備笅锛氱59椤缁冧範 1銆佽В锛氾紙1锛6a²cm²锛涳紙2锛80锛卆鍏冿紱锛3锛塽tkm锛涳紙4锛夛蓟锛坅锛媥锛塨-ab锛絤²銆2銆佽В锛氾紙1锛夛紙t锛5锛夆剝锛涳紙2锛3锛坸-y锛塳m鎴栵紙3x-3y锛塳m锛涳紙3锛夛紙50-5x锛夊厓銆侊紙4锛夛紙蟺R²a-蟺r²a锛塩m3銆3銆佽В锛5...
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绛旓細涓锛氳В锛3锛3x+5)=2(2x-1)9x+15=4x-2 9x-4x=-2-15 5x=-17 x=-17|5 浜岋細瑙ｏ細-3锛坸-3)=-1(3x+4)-3x-9=-3x+4 -3x+3x=4+9 0x=13 x=0 涓锛氳В锛3锛3y-1)-12=2(5y-7)9y-3-12=10y-14 9y-10y=-14+3+12 -y=1 y=-1 鍥涳細瑙ｏ細4锛5y+4)+3(y-1)=24-(...
