五年级数学四道思维训练题目（急） 五年级数学50道思维训练
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\u98983\u3001\u67093\u5143\uff0c5\u5143\u548c7\u5143\u7684\u7535\u5f71\u7968400\u5f20\uff0c\u4e00\u5171\u4ef7\u503c1920\u5143\uff0c\u5176\u4e2d7\u5143\u548c5\u5143\u7684\u5f20\u6570\u76f8\u7b49\uff0c\u4e09\u79cd\u4ef7\u683c\u7684\u7535\u5f71\u7968\u5404\u591a\u5c11\u5f20\uff1f
\u98984\u3001\u7528\u5927\u3001\u5c0f\u4e24\u79cd\u6c7d\u8f66\u8fd0\u8d27\uff0c\u6bcf\u8f86\u5927\u6c7d\u8f66\u88c518\u7bb1\uff0c\u6bcf\u8f86\u5c0f\u6c7d\u8f66\u88c512\u7bb1\uff0c\u73b0\u5728\u670918\u8f66\u8d27\uff0c\u4ef7\u503c3024\u5143\uff0c\u82e5\u6bcf\u7bb1\u4fbf\u5b9c2\u5143\uff0c\u5219\u8fd9\u6279\u8d27\u4ef7\u503c2520\u5143\uff0c\u95ee\uff1a\u5927\u3001\u5c0f\u6c7d\u8f66\u5404\u6709\u591a\u5c11\u8f86\uff1f
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\u98986\u3001\u8fd0\u6765\u4e00\u6279\u897f\u74dc\uff0c\u51c6\u5907\u5206\u4e24\u7c7b\u5356\uff0c\u5927\u7684\u6bcf\u5343\u514b0.4\u5143\uff0c\u5c0f\u7684\u6bcf\u5343\u514b0.3\u5143\uff0c\u8fd9\u6837\u5356\u8fd9\u6279\u897f\u74dc\u5171\u503c290\u5143\uff0c\u5982\u679c\u6bcf\u5343\u514b\u897f\u74dc\u964d\u4ef70.05\u5143\uff0c\u8fd9\u6279\u897f\u74dc\u53ea\u80fd\u5356250\u5143\uff0c\u95ee\uff1a\u6709\u591a\u5c11\u5343\u514b\u5927\u897f\u74dc\uff1f
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1.\u89e3\uff1a\u8bbe\u67091\u5143\u7684x\u5f20\uff0c1\u89d2\u7684(28-x)\u5f20
x+0.1(28-x)=5.5
0.9x=2.7
x=3
28-x=25
\u7b54\uff1a\u6709\u4e00\u5143\u76843\u5f20\uff0c\u4e00\u89d2\u768425\u5f20\u3002
2.\u89e3\uff1a\u8bbe1\u5143\u7684\u6709x\u5f20\uff0c2\u5143\u7684\uff08x-2)\u5f20\uff0c5\u5143\u7684(52-2x)
x+2(x-2)+5(52-2x)=116
x+2x-4+260-10x=116
7x=140
x=20
x-2=18
52-2x=12
\u7b54\uff1a1\u5143\u7684\u670920\u5f20\uff0c2\u514318\u5f20\uff0c5\u514312\u5f20\u3002
3.\u89e3\uff1a\u8bbe\u67097\u5143\u548c5\u5143\u5404x\u5f20\uff0c3\u5143\u7684(400-2x)\u5f20
7x+5x+3(400-2x)=1920
12x+1200-6x=1920
6x=720
x=120
400-2x=160
\u7b54\uff1a\u67093\u5143\u7684160\u5f20\uff0c7\u5143\u30015\u5143\u5404120\u5f20\u3002
4.\u89e3\uff1a\u8d27\u7269\u603b\u6570\uff1a\uff083024-2520\uff09\u00f72=252\uff08\u7bb1\uff09
\u8bbe\u6709\u5927\u6c7d\u8f66x\u8f86\uff0c\u5c0f\u6c7d\u8f66(18-x)\u8f86
18x+12(18-x)=252
18x+216-12x=252
6x=36
x=6
18-x=12
\u7b54\uff1a\u6709\u5927\u6c7d\u8f666\u8f86\uff0c\u5c0f\u6c7d\u8f6612\u8f86\u3002
5.\u89e3\uff1a\u5929\u6570=112\u00f714=8\u5929
\u8bbe\u6709x\u5929\u662f\u96e8\u5929
20(8-x)+12x=112
160-20x+12x=112
8x=48
x=6
\u7b54\uff1a\u67096\u5929\u662f\u96e8\u5929\u3002
6.\u89e3\uff1a\u897f\u74dc\u6570\uff1a\uff08290-250\uff09\u00f70.05=800\u5343\u514b
\u8bbe\u6709\u5927\u897f\u74dcx\u5343\u514b
0.4x+0.3(800-x)=290
0.4x+240-0.3x=290
0.1x=50
x=500
\u7b54\uff1a\u6709\u5927\u897f\u74dc500\u5343\u514b\u3002
7.\u89e3\uff1a\u7532\u5f97\u5206\uff1a\uff08152+16\uff09\u00f72=84\u5206
\u4e59\uff1a152-84=68\u5206
\u8bbe\u7532\u4e2dx\u6b21
10x-6(10-x)=84
10x-60+6x=84
16x=144
x=9
\u8bbe\u4e59\u4e2dy\u6b21
10y-6(10-y)=68
16y=128
y=8
\u7b54\uff1a\u7532\u4e2d9\u6b21\uff0c\u4e598\u6b21\u3002
8.\u89e3\uff1a\u8bbe\u4ed6\u7b54\u5bf9x\u9053\u9898
5x-2(20-x)=86
5x-40+2x=86
7x=126
x=18
\u7b54\uff1a\u4ed6\u7b54\u5bf9\u4e8618\u9898\u3002
0\u30011\u30012\u30013\u30014\u30015\u30016\u30017\u8fd9\u516b\u4e2a\u6570\u5b57\u7ec4\u6210\u56db\u4e2a\u4e24\u4f4d\u4e66\uff0c\u6bcf\u4e2a\u6570\u5b57\u53ea\u7528\u4e00\u6b21\uff0c\u8981\u6c42\u4ed6\u4eec\u7684\u548c\u4e8b\u6280\u672f\uff0c\u5e76\u4e14\u5c3d\u53ef\u80fd\u5730\u5927\u3002\u8fd9\u56db\u4e2a\u4e24\u4f4d\u6570\u7684\u548c\u662f\uff1f
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\u98983\u3001\u67093\u5143\uff0c5\u5143\u548c7\u5143\u7684\u7535\u5f71\u7968400\u5f20\uff0c\u4e00\u5171\u4ef7\u503c1920\u5143\uff0c\u5176\u4e2d7\u5143\u548c5\u5143\u7684\u5f20\u6570\u76f8\u7b49\uff0c\u4e09\u79cd\u4ef7\u683c\u7684\u7535\u5f71\u7968\u5404\u591a\u5c11\u5f20\uff1f
\u98984\u3001\u7528\u5927\u3001\u5c0f\u4e24\u79cd\u6c7d\u8f66\u8fd0\u8d27\uff0c\u6bcf\u8f86\u5927\u6c7d\u8f66\u88c518\u7bb1\uff0c\u6bcf\u8f86\u5c0f\u6c7d\u8f66\u88c512\u7bb1\uff0c\u73b0\u5728\u670918\u8f66\u8d27\uff0c\u4ef7\u503c3024\u5143\uff0c\u82e5\u6bcf\u7bb1\u4fbf\u5b9c2\u5143\uff0c\u5219\u8fd9\u6279\u8d27\u4ef7\u503c2520\u5143\uff0c\u95ee\uff1a\u5927\u3001\u5c0f\u6c7d\u8f66\u5404\u6709\u591a\u5c11\u8f86\uff1f
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\u98986\u3001\u8fd0\u6765\u4e00\u6279\u897f\u74dc\uff0c\u51c6\u5907\u5206\u4e24\u7c7b\u5356\uff0c\u5927\u7684\u6bcf\u5343\u514b0.4\u5143\uff0c\u5c0f\u7684\u6bcf\u5343\u514b0.3\u5143\uff0c\u8fd9\u6837\u5356\u8fd9\u6279\u897f\u74dc\u5171\u503c290\u5143\uff0c\u5982\u679c\u6bcf\u5343\u514b\u897f\u74dc\u964d\u4ef70.05\u5143\uff0c\u8fd9\u6279\u897f\u74dc\u53ea\u80fd\u5356250\u5143\uff0c\u95ee\uff1a\u6709\u591a\u5c11\u5343\u514b\u5927\u897f\u74dc\uff1f
\u98987\u3001\u7532\u3001\u4e59\u4e8c\u4eba\u6295\u98de\u9556\u6bd4\u8d5b\uff0c\u89c4\u5b9a\u6bcf\u4e2d\u4e00\u6b21\u8bb010\u5206\uff0c\u8131\u9776\u6bcf\u6b21\u5012\u62636\u5206\uff0c\u4e24\u4eba\u5404\u629510\u6b21\uff0c\u5171\u5f97152\u5206\uff0c\u5176\u4e2d\u7532\u6bd4\u4e59\u591a\u5f9716\u5206\uff0c\u95ee\uff1a\u4e24\u4eba\u5404\u4e2d\u591a\u5c11\u6b21\uff1f
\u98988\u3001\u67d0\u6b21\u6570\u5b66\u7ade\u8d5b\u5171\u670920\u6761\u9898\u76ee\uff0c\u6bcf\u7b54\u5bf9\u4e00\u9898\u5f975\u5206\uff0c\u9519\u4e86\u4e00\u9898\u4e0d\u4ec5\u4e0d\u5f97\u5206\uff0c\u800c\u4e14\u8fd8\u8981\u5012\u62632\u5206\uff0c\u8fd9\u6b21\u7ade\u8d5b\u5c0f\u660e\u5f97\u4e8686\u5206\uff0c\u95ee\uff1a\u4ed6\u7b54\u5bf9\u4e86\u51e0\u9053\u9898\uff1f
1.\u89e3\uff1a\u8bbe\u67091\u5143\u7684x\u5f20\uff0c1\u89d2\u7684(28-x)\u5f20
x+0.1(28-x)=5.5
0.9x=2.7
x=3
28-x=25
\u7b54\uff1a\u6709\u4e00\u5143\u76843\u5f20\uff0c\u4e00\u89d2\u768425\u5f20\u3002
2.\u89e3\uff1a\u8bbe1\u5143\u7684\u6709x\u5f20\uff0c2\u5143\u7684\uff08x-2)\u5f20\uff0c5\u5143\u7684(52-2x)
x+2(x-2)+5(52-2x)=116
x+2x-4+260-10x=116
7x=140
x=20
x-2=18
52-2x=12
\u7b54\uff1a1\u5143\u7684\u670920\u5f20\uff0c2\u514318\u5f20\uff0c5\u514312\u5f20\u3002
3.\u89e3\uff1a\u8bbe\u67097\u5143\u548c5\u5143\u5404x\u5f20\uff0c3\u5143\u7684(400-2x)\u5f20
7x+5x+3(400-2x)=1920
12x+1200-6x=1920
6x=720
x=120
400-2x=160
\u7b54\uff1a\u67093\u5143\u7684160\u5f20\uff0c7\u5143\u30015\u5143\u5404120\u5f20\u3002
4.\u89e3\uff1a\u8d27\u7269\u603b\u6570\uff1a\uff083024-2520\uff09\u00f72=252\uff08\u7bb1\uff09
\u8bbe\u6709\u5927\u6c7d\u8f66x\u8f86\uff0c\u5c0f\u6c7d\u8f66(18-x)\u8f86
18x+12(18-x)=252
18x+216-12x=252
6x=36
x=6
18-x=12
\u7b54\uff1a\u6709\u5927\u6c7d\u8f666\u8f86\uff0c\u5c0f\u6c7d\u8f6612\u8f86\u3002
5.\u89e3\uff1a\u5929\u6570=112\u00f714=8\u5929
\u8bbe\u6709x\u5929\u662f\u96e8\u5929
20(8-x)+12x=112
160-20x+12x=112
8x=48
x=6
\u7b54\uff1a\u67096\u5929\u662f\u96e8\u5929\u3002
6.\u89e3\uff1a\u897f\u74dc\u6570\uff1a\uff08290-250\uff09\u00f70.05=800\u5343\u514b
\u8bbe\u6709\u5927\u897f\u74dcx\u5343\u514b
0.4x+0.3(800-x)=290
0.4x+240-0.3x=290
0.1x=50
x=500
\u7b54\uff1a\u6709\u5927\u897f\u74dc500\u5343\u514b\u3002
7.\u89e3\uff1a\u7532\u5f97\u5206\uff1a\uff08152+16\uff09\u00f72=84\u5206
\u4e59\uff1a152-84=68\u5206
\u8bbe\u7532\u4e2dx\u6b21
10x-6(10-x)=84
10x-60+6x=84
16x=144
x=9
\u8bbe\u4e59\u4e2dy\u6b21
10y-6(10-y)=68
16y=128
y=8
\u7b54\uff1a\u7532\u4e2d9\u6b21\uff0c\u4e598\u6b21\u3002
8.\u89e3\uff1a\u8bbe\u4ed6\u7b54\u5bf9x\u9053\u9898
5x-2(20-x)=86
5x-40+2x=86
7x=126
x=18
\u7b54\uff1a\u4ed6\u7b54\u5bf9\u4e8618\u9898\u3002 \u67d0\u8fb9\u9632\u7ad9\u7532\u4e59\u4e24\u4e2a\u54e8\u6240\u4e4b\u95f4\u76f8\u8ddd15\u5343\u7c73\uff0c\u4e00\u5929\uff0c\u8fd9\u4e24\u4e2a\u54e8\u6240\u5de1\u903b\u961f\u540c\u65f6\u4ece\u5404\u81ea\u7684\u54e8\u6240\u51fa\u53d1\uff0c\u76f8\u5411\u800c\u884c\uff0c\u7532\u54e8\u6240\u5de1\u903b\u961f\u6bcf\u5c0f\u65f6\u884c5.5\u5343\u7c73\uff0c\u4e59\u54e8\u6240\u5de1\u903b\u961f\u6bcf\u5c0f\u65f6\u884c4.5\u5343\u7c73\uff0c\u4e59\u54e8\u6240\u5de1\u903b\u961f\u521a\u51fa\u53d1\uff0c\u4ed6\u4eec\u5e26\u7684\u4e00\u53ea\u8b66\u72ac\u5c31\u98de\u5feb\u7684\u671d\u7532\u5de1\u903b\u961f\u8dd1\u53bb\uff0c\u9047\u5230\u7532\u961f\u7acb\u5373\u8fd4\u56de\uff0c\u76f4\u5230\u4e24\u961f\u76f8\u9047\uff0c\u5df2\u77e5\u8b66\u72ac\u7684\u901f\u5ea6\u662f\u6bcf\u5c0f\u65f620\u5343\u7c73\uff0c\u8fd9\u53ea\u8b66\u72ac\u4e00\u5171\u8dd1\u4e86\u591a\u5c11\u5343\u7c73\uff1f
因为这样的话，一个来回抢八个，三个来回后，抢了二十四个，甲再抢n个，乙把剩下的都抢了就行了
10、原式=[（1+1993）*1993/2]/1994=891.5
5、（1+2+3+4+5+6+7+8+9+10）*10+（1+2+3+4+5+6+7+8+9）*9=550+405=955
第六题实在不会
5-n
（1994分子1+1994分子1993）x（1994除以2）=997
1+1+0+0=2
先采纳
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