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a)dien h xung quanh cua hinh do la:
(5+4)*2*3=54 (cm2)
b)dien h xung quanh cua hinh do la
(3+4)*2*5=70(cm2)
d/s:a)54 cm2
b)70 cm2
Công thức tính diện tích xung quanh của hình hộp chữ nhật :
S=2 (c.cao nhân c.rộng + c.cao nhân c.dài)
(c. là chiều nha)
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404 chắc chắn với bn lun
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a) thể tích hình hộp chữ nhật là 9*4*5=180(dm3) cạnh hình lập phương là (9+4+5):3=6(dm) b)thể tích hình lập phương là 6*6*6=216(dm3
99*:%6
a ) Mặt lớn nhất là mặt 5 và 4 .
Sxq = ( 5 + 4 ) x 2 x 3 = 54 ( cm2 )
Stp = 54 + 5 x 4 x 2 = 94 ( cm2 )
b ) Mặt bé nhất là mặt 4 và 3
Sxq = ( 4 + 3 ) x 2 x 5 = 70 ( cm2 )
Stp = 70 + 4 x 3 x 2 = 94 ( cm2 )
đ/s : ....