题目内容
6、完成下列单位换算
(1)4.5m=
(2)3h=
(3)20m/s=
(1)4.5m=
4.5×106
μm=4.5×109
nm(2)3h=
180
min=10800
s(3)20m/s=
72
km/h分析:(1)1m=10dm=100cm=1000mm,1m=106μm=109nm.
(2)1h=60min=3600s.
(3)1m/s=3.6km/h.
(2)1h=60min=3600s.
(3)1m/s=3.6km/h.
解答:解:(1)4.5m=4.5×1000000μm=4.5×106μm=4.4×1000000000nm=4.5×109nm.
故答案为;4.5×106,4.5×109.
(2)3h=3×60min=180min,3n=3×3600s=10800s.
故答案为:180;10800.
(3)20m/s=20×3.6km/h=72km/h.
故答案为:72.
故答案为;4.5×106,4.5×109.
(2)3h=3×60min=180min,3n=3×3600s=10800s.
故答案为:180;10800.
(3)20m/s=20×3.6km/h=72km/h.
故答案为:72.
点评:本题考查长度、时间、速度单位的换算,应扎扎实实做好,并学会用准确的数量级来书写,为大题做好坚实的基础.
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