教下·····一块长方形麦田的长是600米,宽是500米,如果用射程是10米的自动旋转喷灌装置进行喷灌,大约需要多少个这

征羽2022-10-04 11:39:541条回答

教下·····
一块长方形麦田的长是600米,宽是500米,如果用射程是10米的自动旋转喷灌装置进行喷灌,大约需要多少个这样的喷灌装置?（请列出算式,但要详细说明,还要解析,）
最好还是不要用方程，尽量吧······

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vvgoody 共回答了22个问题 | 采纳率90.9%: 如果圆圆相切,肯定不能覆盖所有的,
所以,只利用圆内最大正方形的面积进行计算
可知圆的直径为正方形的对角线长
直接为20m,
设正方形变长为x
2x^2=400
x^2=200
即面积为200 m²
麦田总面积为600×500=300000m²
除一下得
3000÷2=1500
需要1500个
这不是方程,面积就是边乘边啊
2x^2意思就是直角三角形中,两边平方之和=第三边的平方; 1年前

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6+9= 5+8= 7+3= 6+6= 9+5=
7+9= 8+8= 5+8= 14-9= 17-6=
4+7= 9+4= 6+8= 9+7= 7+8=
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3+7= 6+8= 9+6= 2+8= 6+9=
14-6= 5+7= 4+7= 7+9= 15-8=
6+9= 8+4= 9+8= 8+5= 9+11=
16-7= 13-7= 7+4= 8+3= 17-6=
19-8= 8+5= 9+5= 8+6= 7+14=
8+2= 4+7= 3+9= 12-8= 5+8
3+5= 13-6= 6+9= 9+5= 13-8=
4+6= 9+9= 8+7= 4+7= 6+3=
12-9= 9-3= 8+3= 5+7= 5+6=
6+8= 9+2= 7+4= 5+5= 4+9=
10+6= 9+5= 10+4= 6+10= 8+5=
14-6= 7+2= 6+5= 6+8= 9+6=
8+5= 3+6= 8+5= 7+9= 5+7=
6+8= 4+7= 5+9= 9+4= 7+8=
6+5= 4+9= 5+7= 7+7= 8+4=
5+3= 2+7= 6+4= 7+4= 3+6=
13-6= 18-9= 11-7= 6+9= （）+5=12
17-9= 13-6= 14-5 = 15-6= 18-（）=9
12-9= 12+8= 11-9= 4+8= 5+（）=14
16-4= 7＋9= 16－7= 2＋17= 11-（）=5
12－8= 17-8= 18-1= 17-8= 17-（）=10
15-7= 10-4 = 14+6 = 16-9= 14+（）=18
15+5= 16-8= 14-7 = 12+8 = （）+8=12
8+6= 14-10 = 8+8= 14-9= （）-12=3
7+5= 14-4= 11+9 = 11-6= （）-8=8
17+1 = 15-8= 16+3= 5+8= （）+5=18
9＋2= 8＋4= 7＋5= 6＋6= 5＋6=
15－9= 14－8= 12－7= 11－6= 13－5=
9＋4= 7＋8= 7＋7= 6＋5= 5＋7=
12－9= 16－8= 15－7= 14－6= 11－5=
9＋6= 8＋8= 7＋6= 6＋8= 5＋8=
16－9= 11－8= 13－7= 15－6= 12－5=
9＋8= 5＋8= 7＋4= 6＋9= 5＋9=
13－9= 13－8= 14－7= 12－6= 14－5=
9＋3= 9＋8= 7＋8= 6＋7= 4＋9=
11－9= 12－8= 16－7= 13－6= 15－5=
14－9= 15－8= 17－10= 12－3= 11－4=
11－3= 12－4= 13－4= 11－2= 14－10=
4＋8= 5＋7= 2＋9= 7＋5= 8＋6=
14－6= 12－5= 11－5= 13－8 15－6=
7＋7= 9＋9= 9＋6= 8＋5= 8＋9=
11－5= 12－6= 14－9= 16－9= 15－8=
4＋7= 6＋6= 8＋8= 9＋3= 7＋7=
14－8= 15－6= 16－9= 17－8= 18－9=
9＋9= 7＋5= 8＋6= 5＋9= 13－8=
17-10= 16-1= 16-2= 16-3= 16-4=
1+11= 1+12= 1+13= 1+14= 1+15=
20-10= 19-1= 19-2= 19-3= 19-4=
18-5= 18-6= 18-7= 18-8= 18-9=
17-5= 17-6= 17-7= 17-8= 17-9=
6-2= 6-3= 6-4= 6-5= 6-6=
16-10= 15-1= 15-2= 15-3= 15-4=
2+7= 2+8= 2+9= 2+10= 2+11=
15-10= 14-1= 14-2= 14-3= 14-4=
1+16= 1+17= 1+18= 1+19= 2+0=
19-5= 19-6= 19-7= 19-8= 19-9=
2+12= 2+13= 2+14= 2+15= 2+16=
15-5= 15-6= 15-7= 15-8= 15-9=
18-10= 17-1= 17-2= 17-3= 17-4=
2+17= 2+18= 3+3= 3+4= 3+5=
19-10= 18-1= 18-2= 18-3= 18-4=
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13-5= 13-6= 13-7= 13-8= 13-9=
4+7= 4+8= 4+9= 4+10= 4+11=
13-10= 12-1= 12-2= 12-4= 12-5=
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教下·····一块长方形麦田的长是600米,宽是500米,如果用射程是10米的自动旋转喷灌装置进行喷灌,大约需要多少个这

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