梯形的面积_4珍藏版本

April 17, 2021, 7:44 a.m. 文档页面

【文章导读】1, ,2,S = ab,S = ah2,S = ah,S = aa, , = , = , = 2, = ,3,1. ,2. ,3. ,4. , ::,4,,,5, 。, , , 。,,,,6,12dm,8dm,,7dm, ,7,,,: ,8,,

文章介绍图片

  

【正文内容】

1,,2,S=ab,S=ah2,S=ah,S=aa,,=,=,=2,=,3,1.,2.,3.,4.,::,4,5,。,,,。,6,12dm,8dm,7dm,,7,:,8,9,。,,10,11,12,13,14,15,,,16,(+),,,,S=(a+b)h2,=2,=(+)2,17,12dm,8dm,7dm,S=(a+b)h2=(12+8)72=2072=70(d),18,14cm,26cm,8cm,S=(a+b)h2=(14+26)82=4082=3202=160(c),14268,19,,20,36.,21,(,2.,(,(),.(),.(),().,22,C,A,B,D,E,287=4(mm)。

73=4(m),S=(ab)h2,=(74)42,=22(),ABCD28ABAE3BCDE,23,350,14m,24,14m,S=(a+b)h2=(5014)142=36142=252(),350,25,m,80,26,18,88,27,,28,,2,29,

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