一幅教学大楼的平面图的比例尺是1:300,在图上量得一间教室的长是3cm,宽是2cm,实际面积是多少平方米?
\u5728\u4e00\u5e45\u6bd4\u4f8b\u5c3a\u4e3a1:500\u7684\u5e73\u9762\u56fe\u4e0a\u91cf\u5f97\u4e00\u95f4\u957f\u65b9\u5f62\u6559\u5ba4\u7684\u957f\u662f3cm\uff0c\u5bbd\u662f2cm\uff0c\u6c42\u8fd9\u95f4\u6559\u5ba4\u7684\u56fe\u4e0a\u9762\u79ef\u4e0e\u56fe\u4e0a\u9762\u79ef\uff1aS=2\u00d73=6\u5e73\u65b9\u5398\u7c73\u3002
\u5b9e\u9645\u9762\u79ef\uff1a\u6bd4\u4f8b\u5c3a\u4e3a1\uff1a500\u8868\u793a\u56fe\u4e0a1\u339d\u7b49\u4e8e\u5b9e\u9645500\u339d\uff0c\u6240\u4ee5\u957f\u65b9\u5f62\u6559\u5ba4\u7684\u5b9e\u9645\u957f\u5ea6\u4e3a3\u00d7500=1500\u339d=15m\uff0c\u5bbd\u5ea6\u4e3a2\u00d7500=1000\u339d=10m\uff0c\u5b9e\u9645\u9762\u79ef\u5c31\u4e3aS\u2018=15\u00d710=150\u5e73\u65b9\u7c73\u3002
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\u5982\u679c\u5728\u56fe\u4e0a\u662f1\u5e73\u65b9\u5398\u7c73\uff08\u5e94\u8be5\u4ee5\u51fa\u56fe\u4e3a\u51c6\uff09\uff0c\u90a3\u4e48\u5b9e\u9645\u9762\u79ef\u5c31\u662f1*4000*4000\u5e73\u65b9\u5398\u7c73,\u537316000 000\u5e73\u65b9\u5398\u7c73\uff0c\u53731600\u5e73\u65b9\u7c73\uff0c
实际长=3×300=900(厘米)=9(米)
实际宽=2×300=600(厘米)=6(米)
实际面积=9×6=54(平方米)
3×300/100=9 2×300/100=6 6×9=54
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