5:(1)S = a×h÷2
=5×8÷2
=20(平方厘米)
(2)S =(a+b)×h÷2
= (3.6+6.4)×5÷2
= 25(平方分米)
6:(1) 2x+3y
(2) 12×2+3×4
=24+12
=36(分)
7:(1) (15-b)b
(2) (15-10)×10
=5×10
=50(平方厘米)
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5:(1)S = a×h÷2
=5×8÷2
=20(平方厘米)
(2)S =(a+b)×h÷2
= (3.6+6.4)×5÷2
= 25(平方分米)
6:(1) 2x+3y
(2) 12×2+3×4
=24+12
=36(分)
7:(1) (15-b)b
(2) (15-10)×10
=5×10
=50(平方厘米)
http://m.ksjqmj.com/wunianjidaan/2324.html
推荐访问