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Nửa chu vi hình chữ nhật là:
96:2=48 (m)
Nửa chu vi hình vuông là:
48+7-3=52 (m)
Cạnh hình vuông là:
52:2=26 (m)
Diện tích hình vuông là:
26x26=676 (m^2)
Nửa chu vi mảnh đất là:
130 : 2 = 65 (m)
Chiều rộng mảnh đất là:
130 : 7 = 18,57 (m)
chiều dài mảnh đất là:
65 - 18,57 = 46,43
Diện tích của mảnh vườn là:
46,43 x 18,56 = 862,21 (m2)
Không biết có đúng không nhưng chúc bạn học tốt nhá
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Nửa chu vi mảnh đất hình chữ nhật hay tổng chiều dài và chiều rộng là:
\(96\div2=48\left(m\right)\)
Chiều dài hơn chiều rộng số mét là:
\(7+3=10\left(m\right)\)
Chiều dài mảnh đất hình chữ nhật là:
\(\left(48+10\right)\div2=29\left(m\right)\)
Chiều rộng mảnh đất hình chữ nhật là:
\(29-10=19\left(m\right)\)
Diện tích mảnh đất hình chữ nhật đó là:
\(29\times19=551\left(m^2\right)\)
Nếu giảm chiều dài đi 23m và tăng chiều rộng 23m thì mảnh đất đó không thay đổi
Cạnh mảnh đất lúc sau là : 400 : 4 = 100 ( m )
Chiều dài mảnh đất là : 100 + 23= 123 ( m )
Chiều rộng mảnh đất là : 100 - 23 = 77 ( m )
DT mảnh đất là : 123 x 77 = 9471 ( m2 )
~ HT ~
nếu tăng chiều rộng thêm 6 và giảm chiều dài đi 6 thì mảnh đất trở thành hình vuông. vậy chiều dài hơn chiều rộng số m là 6+6 = 12 m
chiều rộng ảnh đất
12 : ( 7-3) x 3 = 9 m
chiều dài
9 + 12 = 21
diên tích mảnh đất
9 x 21= 189 m2
Nửa chu vi là:220:2=110 ( m )
Chiều dài hơn chiều rộng:225:5-5=40 ( m )
Chiều dài là:(110+40):2=75 ( m )
Chiều rộng là:(110-40):2=35 ( m )
Diện tích ban đầu là: 75x35=2625 ( m2)
Đáp số : 2625 m2
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