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Bài 3.2:
Chièu rộng là 45*2/5=18cm
CHiều cao là 18*1/3=6cm
V=18*6*45=270*18=4860cm3
Bài 3.3:
Chiều dài là 40:2-8=20-8=12cm
V=5*8*12=5*96=480cm3
Bài 3,1
Diện tích xung quanh:
\(2\times0,9\times\left(1,8+1,2\right)=5,4\left(m^2\right)\)
Diện tích toàn phần:
\(5,4+2\times1,8\times1,2=9,72\left(m^2\right)\)
Bài 3,2
Diện tích xung quanh:
\(1,5\times1,5\times4=9\left(cm^2\right)\)
Diện tích toàn phần:
\(1,5\times1,5\times6=13,5\left(cm^2\right)\)
Bài 3.2
\(S_{XQ}=1.5^2\cdot4=9\left(cm^2\right)\)
\(S_{TP}=9\cdot1.5=13.5\left(cm^2\right)\)
1 Where are the picture which were on this wall
2 My father is the person who has great influence on my behavior
3 Do you like the flowers which I bought this morning?
4 All of us are interested in the man who is teaching us PE
5 What's the name of the girl who lent you this book?
6 I don't know the man who wrote lots of good books
7 The girl who has worked here for 5 days will leave me the message
8 All the man who are businessman attended the meeting
9 Do you know the lady who is presenting the topic
10 I haven't read the novel which was written by Nam cao