估算下面图形的面积
\u8ba1\u7b97\u4e0b\u9762\u56fe\u5f62\u7684\u9762\u79ef42\u00d725-20\u00d722\u00f72
=1050-220
=830\uff08\u5e73\u65b9\u7c73\uff09
\uff0811+22\uff09\u00d710\u00f72+11\u00d78\u00f72
=165+44
=209\uff08\u5e73\u65b9\u7c73\uff09
\uff088.5+15\uff09\u00d713\u00f72-8.5\u00d74\u00f72
=152.75-17
=135.75\uff08\u5e73\u65b9\u7c73\uff09
\u5de6\u8fb9\uff0c4 12 10
\u53f3\u8fb9\uff0c\u770b\u4e0d\u592a\u6e05\uff0c\u4e0d\u8fc7\u65b9\u6cd5\u662f\uff0c\u9762\u79ef\u662f\uff0c\u6574\u683c\u6570\u52a0\u4e0a\uff08\u4e0d\u6ee1\u6574\u683c\u6570\u91cf\u7684\u4e00\u534a\uff09
高：2×3=6厘米
面积：10×6÷2=30平方厘米
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