梯形的高:24×2÷6=8(厘米),
梯形的上底:20-6=14(厘米),
梯形的面积:
(20+14)×8÷2,
=34×8÷2,
=136(平方厘米);
答:原来梯形的面积是136平方厘米.
故答案为:136平方厘米.
一个梯形的下底是20厘米,把上底延长6厘米,就成为一个平行四边形,且面积增加24平方厘米,原来梯形的面积是_.
一个梯形的下底是20厘米,把上底延长6厘米,就成为一个平行四边形,且面积增加24平方厘米,原来梯形的面积是______.
数学人气:889 ℃时间:2020-04-15 02:19:23
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