梯形的面积(郑)新整理

April 17, 2021, 7:40 a.m. 文档页面

【文章导读】1, ,2,, 1. ,S=ah,S=ah2, = , - 2,3,,20,15,5,4,,,,,2015=300(c ),542=10(c), ,4,, ,5,,。,,, , ,, , , ,,,,,,7,。, ,8,, , ,9,;

文章介绍图片

  

【正文内容】

1,,2,1.,S=ah,S=ah2,=,2,3,20,15,5,4,2015=300(c),542=10(c),,4,,5,。,,,,,,7,。,,8,,,9,;,,,,,,,,.,:,:,10,=2,,,=()2,=(+)),+,2,11,+,下底,,,,.,:,:,12,,S=(ab)h2,=(+)2,13,,8,10,12,(5+7)62=1262=36(),(2+4)32=632=9(),(10+5)42=1542=30(),.(:),14,2.。,(),.(),.(),().,15,A.45B.22.5C.22.5,,B,(1)36.5(),16,A.50B.25C.133,3.,

B,(1)85.2.5(),B,20m,80m,40m,S梯=(a+b)h2,(20+80)402,=100402,=40002,=2000(),208040,:2000,18,b=9+3=12(),S=(ab)h2=(9+12)102=21102=105(),9310,:105,?米,2145759,21,45,759平方米,S2个7592,(21+45),45,45,45,45,759,,=,21,45,?米,7592(21+45),=1518(21+45),=151866,=23(),:23,?,2145759,),22,,25,10,15,,23,(2+6)52=852=402=20()。

,(+)2,:20,24,,,,,

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