一根铁丝长251.2米要成100个圆形铁圈，每个圆形圈的半径是多少米？
\u4e00\u6839\u94c1\u4e1d\u957f18.84\u7c73\uff0c\u6b63\u597d\u5728\u4e00\u4e2a\u5706\u5f62\u94c1\u5708\u4e0a\u7ed550\u5708\uff0c\u8fd9\u4e2a\u7ebf\u5708\u7684\u534a\u5f84\u662f\u591a\u5c11\u5398\u7c7318.84\u7c73\u662f\u5706\u5f62\u94c1\u5708\u7684\u5468\u957f\u768450\u500d\uff0c\u7ebf\u5708\u7684\u534a\u5f84\u662f18.84\u00f750\u00f73.14\u00f72=0.06\u7c73=6\u5398\u7c73
1.=\u6839\u53f7\u4e0b18.84/50/\u5140\u5398\u7c73
2.\u6ca1\u770b\u61c2\uff01\uff01\uff01 \u662f\u4e0d\u662f\u5468\u957f\u554a \u5468\u957f=1.44\u5140
3.S\u5706=6.25\u5140 \u5219S\u5269=5*8-6.25\u5140=40-6.25\u5140
4.1080\u7c73=108000\u5398\u7c73 108000/36*36\u5140 \u7ea6\u7b49\u4e8e13\u5708
5.2\u5140r=24.48 r=\u5140/12.42 \u5219S\u5706=\uff08\u5140/12.42\uff09\uff08\u5140/12.42\uff09\u5140
OK\u4e86
251、2÷3,14÷2÷100=0,4
251、2÷3,14÷2÷100=0,4
绛旓細0鍑0绛変簬0涔樹互0锛1涔樹互1绛変簬1闄や互1锛屼簩鍒嗕箣涓鍔犱簩鍒嗕箣涓绛変簬浜屽垎涔嬩竴闄や互浜屽垎涔嬩竴
绛旓細251.2梅4锛62.8绫炽傛鏂瑰舰鐨勮竟闀 62.8脳62.8锛3943.84骞虫柟绫筹紝姝ｆ柟褰㈢殑闈㈢Н 251.2梅3.14梅2锛40绫炽傚崐寰 3.14脳40脳40锛5024骞虫柟绫炽傚渾鐨勯潰绉
绛旓細251.2梅3.14=80绫 80+10+10=100绫 3.14脳100=314绫
绛旓細姝ｆ柟褰㈣竟闀:251.2梅4=62.8 姝ｆ柟褰㈤潰绉:62.8脳62.8=3943.84 鍦嗗崐寰:251.2梅3.14梅2=40 鍦嗛潰绉:40脳40脳3.14=5024 鍦嗛潰绉ぇ 澶т簡:5024-3943.84=1080.16骞虫柟绫
绛旓細杩愮敤浣撶Н鐩哥瓑鐨勫師鐞嗭細鍗冲渾鏌变綋鐨勪綋绉=鍦嗛敟浣撶殑浣撶Н 鍦嗘煴浣撶殑浣撶Н=鍗婂緞X鍗婂緞X3.14锛堝簳闈㈢Н锛塜楂 鍦嗛敟浣撶殑浣撶Н=1/3X鍗婂緞X鍗婂緞X3.14锛堝簳闈㈢Н锛塜楂 宸茬煡锛氬渾閿ヤ綋鐨勫簳闈㈠懆闀=251.2锛岄偅涔堝簳闈㈠崐寰=251.2/(2*3.14)=40 鍦嗘煴浣擄細楂=5绫筹紱鍦嗛敟浣擄細搴曢潰鍗婂緞=40绫.,楂=0.3绫 姹傦細鍦嗘煴浣撶殑楂,...
绛旓細1.鐗涙爮鍛ㄩ暱锛3.14脳20脳2=125.6绫 闇瑕閾佷笣锛125.6脳2=251.2绫 闇瑕鏈ㄦ々锛125.6梅2=62.8鈮63鏍 2.鍦嗙殑鐩村緞灏辨槸6鍘樼背 鍗婂緞涓6梅2=3鍘樼背 鍛ㄩ暱锛3.14脳6=18.84鍘樼背 闈㈢Н锛3.14脳3脳3=28.26骞虫柟鍘樼背
绛旓細251.2梅3.14梅2=40锛堢背锛40绫=4000鍘樼背4000脳11000=4鍘樼背浣滃浘濡備笅锛
绛旓細3銆丆=2*3.14*15=94.2绫 4銆佺洿寰刣=15.7/3.14=5绫 5銆乻=60*120*3.14*0.7/1000=15.8256鍗冪背 6銆佹粴涓滃湀鏁癗=锛60*3.14*90锛/锛40*3.14锛=135 7銆佸崐寰凴=18.84/(50*2*3.14)=0.06m=6cm 8銆丼=3.14*锛15*15-10*10锛=骞虫柟鍘樼背 9銆佺Щ鍔ㄨ窛绂籐=2*1.2*3.14*45/60=5...
绛旓細1,鍒嗛拡鍗婂皬鏃惰蛋鍗婂湀 鍦嗗懆闀=2*3.14*鍗婂緞r 鍗婂湀灏辨槸鍦嗗懆闀跨殑涓鍗 =3.14*鍗婂緞r= 3.14*10=31.4 2.40cm=0.4m 涓鍦堣蛋 2*3.14*0.4=2.512 锛堝渾鐨勫懆闀匡級姣忓垎閽熷彲浠ヨ蛋100*2.512=251.2 锛堝懆闀跨殑100鍊嶏級鎬婚暱搴︽槸2512绫 鎵浠ラ渶瑕佺殑鏃堕棿鏄2512/251.2=10鍒嗛挓 鎬昏绠楀紡涓 2512梅锛0....
绛旓細4. 鍦嗗舰鍠锋按姹犲崐寰剅锛20梅2=10锛堢背锛夊皬璺鍦堝崐寰凴锛10+1=11锛堢背锛夊渾褰㈠柗姘存睜闈㈢Н锛3.14脳10脳10=314锛堝钩鏂圭背锛夊皬璺鍦堝渾闈㈢Н锛3.14脳11脳11=379.94锛堝钩鏂圭背锛夊皬璺殑闈㈢Н锛379.94-314=65.94锛堝钩鏂圭背锛夌瓟锛氬皬璺殑闈㈢Н鏄65.94骞虫柟绫炽5 鍥犱负闀挎柟褰㈢焊闀30绫筹紝瀹12鍘樼背锛堟槸涓嶆槸鍗曚綅閿欎簡...
