《长方体和正方体的表面积ppt》由会员分享,可在线阅读,更多相关《长方体和正方体的表面积ppt(21页珍藏版)》请在金锄头文库上搜索。
1、 )1( ) 6( ) ( ) -(2( ) 6( ) ( )7( )3 ( ) 4 ( 12 ) 56 ( . 437 2. ) ( 12 ) 72 ( .6 6 6? . 6 . = = = = = = = = = = + + + + = + + + + + )= + + + + + ( )= ( 2+) ( 2)+ ( 2)= + + ( 2 = = = = = = . = + + + + + = 6)= (6 . 6 )= ( 2+) ( 2)+ ( 2)= + + ( 2 )= (6 0.352 + 0.282 + 0.22 =0.7 + 0.56 + 0. 4 =1.66(m2)
2、) ( )0.7( ) 0.5( ) 0.35 ( )0.7( ) 0.4( ) 0.28 ( )0.5( ) 0.4( ) 0.2 ( . : 66.1 (0.70.5)2 + (0.70.4) 2 + (0.40.5) 2 =0.7 + 0.56 + 0. 4 =1.66(m2) =0.352 + 0.282 + 0.22 ) ( . . : 66.1 (0.70.5)2 + (0.70.4) 2 + (0.40.5) 2 =0.352 + 0.282 + 0.22 =0.7 + 0.56 + 0. 4 (0.70.5)2 + (0.70.4) 2 + (0.40.5) 2 =0.352
3、+ 0.282 + 0.22 =1.66(m2) =0.7 + 0.56 + 0. 4 (0.70.5)2 + (0.70.4) 2 + (0.40.5) 2 =0.352 + 0.282 + 0.22 =1.66(m2) =0.7 + 0.56 + 0. 4 =0.352 + 0.282 + 0.22 =1.66(m2) =0.7 + 0.56 + 0. 4 (0.70.5)2 + (0.70.4) 2 + (0.40.5) 2 =0.352 + 0.282 + 0.22 =1.66(m2) =0.7 + 0.56 + 0. 4 _= _(dm2)1.21.26 8.64 . : 66.1
4、1.2 1 . - 4 3 2. 2. 1.5 .- . 0.75 0.750.50.52+0.752+0.751.61.62+0.52+0.51.61.62 2 =0.75 + 2.4 + 1.6 =0.75 + 2.4 + 1.6 =4.75 =4.75( m2 ) 0.75 0.5 1.6 )( . : 57.4 3 3 6 3 3= 54 9 = 45(dmdm2 2) 3. ) (. : 54 862 + 462 + 842= 96 + 48 + 64 = 208 () 20822.46 8 = 137.6() 3 . 864 . 22.4 : 6.731 15cm5cm10cm 17- .