(1.4+2.8)×1.2÷2,
=4.2×1.2÷2,
=2.52(平方米);
答:它的横截面的面积是2.52平方米.
一条新挖的水渠,横截面是梯形.渠口宽2.8米渠底宽1.4米,渠深1.2米.它的横截面的面积是多少平方米?
一条新挖的水渠,横截面是梯形.渠口宽2.8米渠底宽1.4米,渠深1.2米.它的横截面的面积是多少平方米?
数学人气:227 ℃时间:2019-08-19 10:24:55
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