数学应用题
\u6570\u5b66\u5e94\u7528\u9898\u4e0b\u534a\u5e74\uff1a196*3/7=84\uff08\u4e07\u4eba\uff09
\u7b2c\u4e8c\u5b63\u5ea6\uff1a\u4e0b\u534a\u5e74*3/4=196*3/7*3/4=84*3/4=63\uff08\u4e07\u4eba\uff09
\u7b54\uff1a\u7b2c\u4e8c\u5b63\u5ea6\u63a5\u5f85\u6e38\u5ba263\u4e07\u4eba
\u5e0c\u671b\u53ef\u4ee5\u5e2e\u5230\u697c\u4e3b\uff01
1 \u89e3\uff1a\u8fdb\u4ef7\u4e3a 210+700 =910 (\u5143)\uff0c\u6240\u4ee5\u9500\u552e\u603b\u4ef7\u4e3a 910 + 340 = 1250 (\u5143)
\u5546\u54c1\u603b\u4ef6\u6570\u4e3a 1250 / 25 = 50 (\u4ef6)
\u8bbe\u4ece\u7532\u5730\u91c7\u8d2dX\u4ef6\uff0c\u4ece\u4e59\u5730\u91c7\u8d2d 50-X\u4ef6\uff0c\u4f9d\u9898\u610f
210/X - 700/(50-X) = 3.5
210*50 - 210X - 700X = 3.5(50X-X^2)
3000- 260X = 50X - X^2
X^2 - 310X +3000 = 0
(X-300)(X-10) =0
\u5f97 X1=300\uff0cX2=10
X1=300 \u4e0d\u5408\u9898\u610f\uff0c\u6240\u4ee5\u4ece\u7532\u5730\u91c7\u8d2d 10\u4ef6\uff0c\u4ece\u4e59\u5730\u91c7\u8d2d40\u4ef6\u3002
2. \u89e3\uff1a\u4e24\u6708\u540e\u552e\u4ef7\u4e3a 625*(1-20%)(1+6%) = 530(\u5143)
\u9500\u552e\u5229\u6da6\u4e0d\u53d8\uff0c\u5219\u6210\u672c\u4e3a 530 - (625-500) = 405(\u5143)
\u8bbe\u4ea7\u54c1\u7684\u6210\u672c\u4ef7\u5e73\u5747\u6bcf\u6708\u5e94\u964d\u4f4e X\uff0c\u4f9d\u9898\u610f\uff0c\u5f97
500(1-X)(1-X) = 405
\u5373 100 -200X +100X^2 = 81
100X^2-200X +19=0
(10X-19)(10X-1)=0
\u5f97 X = 1.9 \u6216 X=0.1
X = 1.9\u4e0d\u5408\u9898\u610f\uff0c\u53d6X=0.1=10%\uff0c\u6545\u5e73\u5747\u6bcf\u6708\u5e94\u964d\u4f4e10%
a=2,b=3
设x为A毛笔价格，y为B毛笔价格
可列出
20x+15y+(40-15)(y-0.6)=145
20x+20(x-0.4)+15y+(20-15)(y-0.6)=129
求解方程组就可以了
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