加人教版小学数学五上名师教学视频配套课件教案-组合图形面积

组合图形的面积浙江省宁波市海曙区镇明中心小学裘雅人教版小学数学五年级上册基本图形：组合图形：

像这样由几个简单的图形组合而成的图形叫组合图形。给这座漂亮房子的侧面装上玻璃，需要装多大的玻璃呢？？m？m？m？m？m？m？m？m？m？m5m5m2m5m5m2m5m2m5m5m2m5m5m2m5m2m5m5mS组=S-S=5×5-5×2÷2=25-5

=20（平方米）

5m5m2m2m5m5m求下面这两个组合图形的面积30m13m13m30m33m50m35m12mS组=S-S=30×30-13×13=900-169

=731（平方米）

S组=S+S=50×33+35×12÷2=1650+210

=1860（平方米）

某工厂有一种用铁皮剪成的零件。（如图）

请计算做一个这样的零件要用多少铁皮?10m5m12m6m10m5m12m6m10m5m12m6m10m5m12m6m10m5m12m6m10m5m12m6m找一找：6X5+(5+10)×（12-6）÷210m5m12m6m10m5m12m6m10m5m12m6m10m5m12m6m找一找：10m5m12m6m10m5m12m6m10m5m12m6m

6X5+(5+10)×（12-6）÷25X12+(12-6)×（10-5）÷210m5m12m6m找一找：10m5m12m6m10m5m12m6m10m5m12m6m

6X5+(5+10)×（12-6）÷25X12+(12-6)×（10-5）÷210m5m12m6m找一找：10m5m12m6m10m5m12m6m10m5m12m6m

6X5+(5+10)×（12-6）÷25X12+(12-6)×（10-5）÷2（6+12）X5÷2+10×（12-6）÷210m5m12m6m找一找：10m5m12m6m10m5m12m6m10m5m12m6m

6X5+(5+10)×（12-6）÷25X12+(12-6)×（10-5）÷2（6+12）X5÷2+10×（12-6）÷210m5m12m6m找一找：10m5m12m6m10m5m12m6m10m5m12m6m

6X5+(5+10)×（12-6）÷25X12+(12-6)×（10-5）÷2（6+12）X5÷2+10×（12-6）÷210X12-(6+12)×（10-5）÷210m5m12m6m找一找：10m5m12m6m10m5m12m6m10m5m12m6m

6X5+(5+10)×（12-6）÷25X12+(12-6)×（10-5）÷2（6+12）X5÷2+10×（12-6）÷210X12-(6+12)×（10-5）÷210m5m12m6m找一找：10m5m12m6m10m5m12m6m10m5m12m6m

6X5+(5+10)×（12-6）÷25X12+(12-6)×（10-5）÷2（6+12）X5÷2+10×（12-6）÷210X12-(6+12)×（10-5）÷2张爷爷跟李爷爷用两条长26米的篱笆分别围了两块块菜地，请你算一算哪块菜地的面积大？S组=S-S

=9×8-（9-5）×（8-4）=72-16

=56（平方米）

李爷爷因为72＞56所以张爷爷的菜地面积大。张爷爷