Hình bên là 1 loại gạch hay được dùng để lát vỉa hè hay lát sân. Biết mỗi miếng gạch hình vuông có cạnh dài 3dm. Tính diện tích hình tròn ( lớn nhất ) khi ghép bốn miếng gạch lại với nhau?
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
- Loại 1 được dùng để xây tường.
- Hình 2a được dùng để lát sân, vỉa hè.
- Hình 2b được dùng để lát sàn.
- Hình 2c được dùng để ốp tường.
![](https://rs.olm.vn/images/avt/0.png?1311)
Diện tích hình chữ nhật:12*15=180 m2
Diện tích 1 viên gạch:0,3*0,3=0,09 m2
Cần số viên gạch để nát:
180:0,09=2000 viên
=>Số tiền để nát sân:
180*520.000:3=31.200.000 đồng
Đ s:
a, 2000 viên gạch
b,31.200.000đồng
Diện tích hình chữ nhật là:
15x12=4158(m2)
Diện tích một viên gạch hình vuông là:
3x3=9(dm2)
Đổi 4158 m2=415800 dm2
Số viên gạch dùng để lát sân là:
415800 : 9 =46200(viên)
b)Số tiền để lát sân là:
4158 :3 x 520 000 =720 720 000(đồng)
Đề sai hay sao nha bạn
![](https://rs.olm.vn/images/avt/0.png?1311)
Chiều dài sân chơi là: \(28\times4=112\left(m\right)\)
Đổi: \(28m=2800cm;112m=11200cm\)
Mỗi hàng theo chiều dài cần số viên gạch là:
\(11200:50=224\) (viên)
Mỗi hàng theo chiều rộng cần số viên gạch là:
\(2800:50=56\) (viên)
Số viên gạch cần dùng là:
\(224\times56=12544\) (viên)
Ta có: \(12544:350=35\) (dư 294)
Vậy cần ít nhất 36 chuyến xe.
Bài giải:
Chiều dài của sân chơi đó là:28 x 4 = 112 [ m ]
Diện tích sân chơi đó là:
112 x 28 = 3136 [ m 2 ]
Hay = 31360000 cm2
Diện tích 1 viên gạch là:
50 x 50 = 2500 [ cm2 ]
Cần số viên gạch để lát kín sân chơi đó là:
31360000 : 2500 = 12544 [ viên ]
Ta có: 12544 : 350 = 35 [ dư 294 ]
Vì 294 viên gạch vẫn cần 1 chuyến nữa để chuyển
=> Cần số chuyến là: 35 + 1 = 36 [ chuyến ]
Đáp số: 36 chuyến
Xong rùi đó mình chúc bạn học tốt nha!!!
P/S: Hok Tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
Diện tích của căn phòng là:
\(6\times9=54\left(m^2\right)\)
Đổi: 3dm = 0,3m
Diện tích của mỗi viên gạch là:
\(0,3\times0,3=0,09\left(m^2\right)\)
Số viên gạch cần dùng để lát căn phòng là:
\(54:0,09=600\) (viên)
Đáp số: 600 viên
![](https://rs.olm.vn/images/avt/0.png?1311)
Chiều rộng nên nhà là;
\(45:2-18=4,5\) ( m )
a, DT nền nhà là:
\(18.4,5=81\) ( m2 )
b, DT một viên gạch là:
\(3.3=9\) ( dm2 ) \(=0,09\) ( m2 )
Cần số viên gạch để lát nền nhà là:
\(81:0,09=900\) ( viên )
Đ/S:...
a) Nữa cho vi hình chữ nhật:
\(45:2=225\left(m\right)\)
Chiều rộng hình chữ nên nhà:
\(22,5-18=3,5\left(m\right)\)
Diện tích nền nhà:
\(3,5\times18=63\left(m^2\right)\)
b) Đổi: 3dm = 0,3m
Diện tích mỗi viên gạch:
\(0,3\times0,3=0,09\left(m^2\right)\)
Số viên gạch cần lát là:
\(63:0,09=700\) (viên)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Diện tích miếng gạch men là :
50*30 = 1500 (m2)
Diện tích căn phòng là :
1500*59 = 88500 (m2)
b) Số tiền mua gạch men là :
59*37000 = 2183000 (đồng)
(( Chúc bạn học tốt )) mình không biết phải không hen mong bạn làm rồi hỏi cô xem.
Theo mình bạn Huỳnh Thiên Phước làm đúng rồi đó!
![](https://rs.olm.vn/images/avt/0.png?1311)
Ssân nhà = 80 m2
Sviên gạch = 0,25 m2
số viên gạch cần là: 80 : 0,25 = 320 viên gạch
số thùng gạch cần là: 320 : 5 = 64 thùng
Đs: 64 thùng
khi ghép 4 miếng gạch với nhau có hình 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)
từ hình vẽ=> R=3dm=>S hình tròn =\(\pi\).R^2=3^2.\(\pi\)=9.\(\pi\)