初一一元一次方程
\u521d\u4e00,\u4e00\u5143\u4e00\u6b21\u65b9\u7a0b3.
\u89e3\uff1a\u8bbe\u961f\u4f0d\u957f\u5ea6\u4e3ax\u5343\u7c73
\u5206\u6790\uff1a\u6c7d\u8f66\u4eba\u4e0e\u961f\u4f0d\u662f\u76f8\u9047\u95ee\u9898
\u76f8\u9047\u8def\u7a0b\u5c31\u662f\u961f\u4f0d\u7684\u957f\u5ea6
\u7b49\u91cf\u5173\u7cfb\uff1a\u5b66\u751f\u4e0e\u961f\u4f0d\u7684\u901f\u5ea6\u548c=\u8def\u7a0b\u00f7\u76f8\u9047\u65f6\u95f4
x\u00f7(2/60)=3+9
30x=12
x=0.4
\u7b54\uff1a\u961f\u4f0d\u957f\u5ea60.4\u5343\u7c73\uff08400\u7c73\uff09
4.
\u89e3\uff1a\u8bbe\u8e22\u8d1f\u573a\u6570\u4e3ax\uff0c\u5219\u8e22\u5e73\u573a\u6570\u4e3a2x\uff0c\u80dc\u5229\u573a\u6570\u4e3a8-x-2x
\u7b49\u91cf\u5173\u7cfb\uff1a\u80dc\u5229\u5f97\u5206+\u8e22\u5e73\u5f97\u5206=\u603b\u5206
3(8-x-2x)+2x=17
24-9x+2x=17
7x=7
x=1
8-x-2x=8-3=5
\u7b54\uff1a\u80dc\u4e865\u573a
5.
1\uff09
\u89e3\uff1a\u8bbe\u5b89\u6392x\u4eba\u751f\u4ea7\u87ba\u9489\uff0c28-x\u4eba\u751f\u4ea7\u87ba\u6bcd
\u7b49\u91cf\u5173\u7cfb\uff1a\u87ba\u9489\u603b\u6570\u00d72=\u87ba\u6bcd\u603b\u6570
12x\u00d72=18\uff0828-x)
\u65b9\u7a0b\u4e24\u8fb9\u540c\u65f6\u9664\u4ee56\uff0c\u5f97\uff1a
4x=3\uff0828-x\uff09
4x=84-3x
7x=84
x=12
28-12=16
\u7b54\uff1a\u5b89\u639212\u4eba\u751f\u4ea7\u87ba\u9489\uff0c16\u4eba\u751f\u4ea7\u87ba\u6bcd
2\uff09
\u6709\u4e00\u4eba\u8bf7\u5047\uff0c\u5219\u603b\u4eba\u6570\u4e3a28-1=27\u4eba
\u89e3\uff1a\u8bbe\u5b89\u6392x\u4eba\u751f\u4ea7\u87ba\u9489\uff0c27-x\u4eba\u751f\u4ea7\u87ba\u6bcd
2\u00d712x=18(27-x)
4x=3(27-x)
4x=81-3x
7x=81
\u65b9\u7a0b\u7684\u89e3\u4e0d\u662f\u6574\u6570\uff0c\u4e0e\u5b9e\u9645\u4e0d\u7b26
\u6240\u4ee5\u8be5\u5929\u6240\u751f\u4ea7\u7684\u87ba\u9489\u4e0e\u87ba\u6bcd\u4e0d\u80fd\u521a\u597d\u914d\u5957
6.
15\u00f72=7.5
\u6839\u636e\u9898\u610f\uff0c4\u6708\u4efd\u8d85\u8fc7\u4e867.5\u7acb\u65b9\u7c73
\u5982\u679c\u4e24\u4e2a\u6708\u7528\u6c34\u90fd\u8d85\u8fc76\u7acb\u65b9\u7c73\uff0c\u90a3\u4e484\u6708\u7528\u6c34\u4e0d\u8d85\u8fc715-6=9\u7acb\u65b9\u7c73
\u4e24\u4e2a\u6708\uff0c\u6c34\u8d39\u4e00\u5171\uff1a
6\u00d72\u00d72+\uff0815-6\u00d72\uff09\u00d74=24+12=36\u5143\uff0c\u4e0e\u9898\u610f\u4e0d\u7b26
1\uff093\u6708\u7528\u6c34\u4e0d\u8d85\u8fc76\u7acb\u65b9\u7c73,4\u6708\u7528\u6c34\u8d85\u8fc710\u7acb\u65b9\u7c73
\u89e3\uff1a\u4e24\u4e2a\u6708\u7528\u6c346\u7acb\u65b9\u7c73\u4ee5\u4e0b\u7684\uff0c\u4e00\u5171x\u7acb\u65b9\u7c73\uff0c
\u8d85\u8fc76\u7acb\u65b9\u7c73\u7684\uff0c\u4e0d\u8d85\u8fc710\u7acb\u65b9\u7c73\u7684\uff0c\u670910-6=4\u7acb\u65b9\u7c73
\u8d85\u8fc710\u7acb\u65b9\u7c73\u7684\uff0c\u670915-x-4\u7acb\u65b9\u7c73\uff0c
6*2+4*4+8\uff0815-x-4)=44
12+16+8(11-x)=44
28+88-8x=44
8x=72
x=9
3\u6708\u7528\u6c34\uff1a9-6=3\u7acb\u65b9\u7c73
4\u6708\u7528\u6c34\uff1a15-3=12\u7acb\u65b9\u7c73
2\uff09
3\u6708\u7528\u6c34\u4e0d\u8d85\u8fc76\u7acb\u65b9\u7c73\uff0c4\u6708\u7528\u6c34\u4e0d\u8d85\u8fc710\u7acb\u65b9\u7c73
\u89e3\uff1a\u8bbe3\u6708\u7528\u6c34x\u7acb\u65b9\u7c73\uff0c\uff08x\u22646),4\u6708\u7528\u6c3415-x\u7acb\u65b9\u7c73
2x+2\u00d76+4(15-x-6)=44
2x+12+36-4x=44
2x=4
x=2
15-2=13\uff1e10\uff0c\u4e0e\u9898\u8bbe\u4e0d\u7b26
\u7efc\u4e0a\uff0c3,4\u6708\u7528\u6c34\u53ea\u6709\u4e00\u79cd\u60c5\u51b5\uff0c\u5373\uff1a
3\u6708\u7528\u6c343\u7acb\u65b9\u7c73\uff0c4\u6708\u7528\u6c3412\u7acb\u65b9\u7c73
\u89e3\uff1a\u8bbe\u7532\u8f66\u5428\u6570\u4e3a6X\u5428\uff0c\u5219\u4e59\u4e19\u5206\u522b\u4e3a7X\u548c4.5X\u3002
\u6839\u636e\u5df2\u77e5\u6761\u4ef6\uff1a6X-4.5X=12\uff0c\u5f97\u51faX=8
\u4e09\u8f86\u8f66\u5171\u8fd0\u8d27\u7269\u4e3a\uff1a \uff086+7+4.5\uff09X=17.5\u00d78=140\uff08\u5428\uff09
13x+11（104-x）=1240
13x+1144-11x=1240
2x=96
x=48
104-x=56
答：1班48人，2班56人。
2、 1240-104x9=304（元)
答：省304元
设：一班有X人，二班有Y人
x+y=104
13x+11y=1240
解得：X=48,Y=56
团体购票：104*9=936元
1240-936=304
所以省了304元
（1）设一班有x人，则二班有（104-x）人
13*x+11*(104-x)=1240
x=48
故一班有48人，则二班有56人
（2）1240-104*9=304
故节省304元
设一班x人 二班y人 13x+11y=1240
x+y=104 得x=48 y=56
节约钱=1240-104*9=304
失误，补加下 设一班x人 13x+11（104-x）=1240 是一元一次方程
得 x=48 二班=104-x=56
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