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问题 解答题

做一个有盖的圆柱体铁皮汽油桶，已知油桶的底面直径是8分米，高10分米，做这个汽油桶至少需要铁皮多少平方分米？（用进一法保留一位小数）如果每升汽油重0.85千克，这个汽油桶大约可装汽油多少千克？（用去尾法保留整数）

答案

（1）3.14×8×10+3.14×（8÷2）2×2，

=251.2+3.14×16×2，

=251.2+100.48，

=351.68（平方分米），

≈352（平方分米）；

（2）3.14×（8÷2）2×10，

=3.14×16×10，

=502.4（立方分米）；

502.4立方分米=502.4升；

502.4×0.85=427.04（千克）≈427千克；

答：做成这个汽油桶需要铁皮352平方分米，这个油桶能装汽油427千克．

单项选择题

用解析法和勘丈法测定城镇街坊内部隐蔽的界址点及村庄内部的界址点位置时，界址点间距允许误差，界址点与邻近地物点距离允许误差为( )厘米。

A．±10
B．±5
C．±7.5
D．±15
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