学霸们，这道题不会，一元一次方程解啊，帮帮忙
\u5c31\u4e00\u9053\u9898\uff01\uff01\u5b66\u9738\u5feb\u6765\uff01\u7528\u4e00\u5143\u4e00\u6b21\u65b9\u7a0b\u89e3\uff01\u6211\u4f1a\u7ed9\u91c7\u7eb3\u7684
\u7b2c\u4e00\u5757\u5408\u91d1\u4e2d\uff1a
\u7eaf\u91d1\u53602.4/(2.4+3.6)=2.4/6=2/5
\u7eaf\u94f6\u53603.6/(2.4+3.6)=3.6/6=3/5
\u7b2c\u4e8c\u5757\u5408\u91d1\u4e2d\uff1a
\u7eaf\u91d1\u53601.8/(1.8+0.6)=1.8/2.4=3/4
\u7eaf\u94f6\u53600.6/(1.8+0.6)=0.6/2.4=1/4
\u8bbe\u7b2c\u4e00\u5757\u5408\u91d1\u53d6x\u5343\u514b\uff0c\u7b2c\u4e8c\u5757\u5408\u91d1\u53d6(2.8-x)\u5343\u514b
(2/5)x+(3/4)*(2.8-x)=(1/2)*2.8
2x/5 +2.1 -3x/4 = 1.4
7x/20 = 0.7
x=2
\u7b2c\u4e00\u5757\u5408\u91d1\u53d62\u5343\u514b (\u5f97\u52300.8\u5343\u514b\u91d1\uff0c1.2\u5343\u514b\u94f6)
\u7b2c\u4e8c\u5757\u5408\u91d1\u53d60.8\u5343\u514b (\u5f97\u52300.6\u5343\u514b\u91d1\uff0c0.2\u5343\u514b\u94f6)
\u8bbe\u539f\u672c\u7532\u5bb9\u5668\u6709x\u5347\uff0c\u90a3\u4e48\u4e59\u5bb9\u5668\u6709(72-x)\u5347
[x-(72-x)]*2=36
2x-72=18
x=45
\u539f\u672c\u7532\u5bb9\u5668\u670945\u5347\uff0c\u4e59\u5bb9\u5668\u670927\u5347
解：设驴子原来驮x袋，
则得到方程：2（x-1）-1-1=x+1，
解得：x=5，
答：驴子原来所托货物的袋数是5．
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绛旓細20% x + (1 - 20%)(320 - x) = 320 * 40 20% x + 80%(320 - x) =320 * 40 x + 4(320 - x) = 320 * 2 x + 1280 - 4x = 640 4x - x = 1280 - 640 3x = 640 x = 213.333333333
