【用0,1,2,3,4,5,6,7,8,9这十个数分别入三个算式,三个算式为:】
【132页9题如图,ABCD是平行四边形,BE‖DF,分别交对角线AC于E,F,连接DE、BF,求证∠1=∠2.133页13题水库大坝横截面为梯形,B=30,C=45,坝顶AD=6m,CD=20m,南无,坝底BC的长以及横截面积分别是多少(精确到0.1m)?】
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