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Bài \(5\). Bài giải
Chiều dài mảnh đất là:
\(\left(88+8\right):2=48\left(m\right)\)
Chiều rộng mảnh đất là:
\(88-48=40\left(m\right)\)
Diện tích mảnh đất là:
\(48\times40=1920\left(m^2\right)\)
Đ/s: \(1920m^2\)
Bài \(6\). Bài giải
Nửa chu vi mảnh đất là:
\(88:2=44\left(m\right)\)
Chiều dài mảnh đất là:
\(\left(44+8\right):2=26\left(m\right)\)
Chiều rộng mảnh đất là:
\(44-26=18\left(m\right)\)
Diện tích mảnh đất là:
\(26\times18=468\left(m^2\right)\)
Đ/s: \(468m^2\)
Chiều rộng của mảnh đất đó là :
48 : 2 - 15,8 = 8,2 ( m )
Đáp số : 8,2 m
Chiều rộng mảnh đất hình chữ nhật là:
\(180\div12=15\left(m\right)\)
Chiều dài mảnh đất hình chữ nhật là:
\(15+12=27\left(m\right)\)
Chu vi mảnh đất hình chữ nhật là:
\(\left(27+15\right)\times2=84\left(m\right)\)
Chu vi mảnh đất hình vuông là:
\(15\times4=60\left(m\right)\)
Tong chieu dai va chieu dai va chieu rong la
87,6 : 2 =43,8
chieu dai la:[43,8+8,8] : 2 =.....[tu ma tinh]
chieu rong la:[chieu dai]-8,8=...[tu ma tinh]
dt:chieu dai nhan chieu rong
Nửa chu vi hình chữ nhật đó là:
160 : 2 = 80 (m)
Chiều dài là:
(80 + 20) : 2 = 50 (m)
Chiều rộng là:
50 - 20 = 30 (m)
Diện tích hình chữ nhật đó là:
50 x 30 = 150 (m2)
nửa chu vi mảnh đất là : 160 : 2 = 80 ( m )
vẽ sơ đồ nhé mình ko biết vẽ trên máy tính thế nào
chiều dài mảnh đất là : ( 80 + 20 ) : 2 = 50 ( m )
chiều rộng mảnh đất là : 80 - 50 = 30 ( m )
diện tích mảnh đất là : 50 x 30 = 1500 ( m2 )
đúng 100% luôn
Nửa chu vi hcn là: 120:2=60(m)
chiều dài hcn la: (60+10):2=35(m)
chiều rộng hcn là: 35-10=25(m)
diện tích hcn là: 25X35=875(m2)
Đ/S: 875 (m2)
Giải:
Nửa chu vi của mảnh đất là:
71,6 : 2 = 35,8(m)
Theo bài ra ta có sơ đồ:
Theo sơ đồ ta có:
Chiều dài của mảnh đất hình chữ nhật là:
(35,8 + 16,8) : 2 = 26,3(m)
Chiều rộng của mảnh đất hình chữ nhật là:
35,8 - 26,3 = 9,5(m)
Diện tích của mảnh đất hình chữ nhật là:
26,3 x 9,5 = 249,85(m\(^2\))
Đáp số: 249,85m\(^2\)
90012+31245
Ta có sơ đồ:
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