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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 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:
\(29\times19=551\left(m^2\right)\)
Chiều dài hơn rộng là:
7+7 = 14 (m)
Nửa chu vi HCN là:
182:2 = 91 (m)
Chiều rộng là:
( 91-14):2=43,5 (m)
chiều dài là:
91-43,5=47,5 (m)
Nửa chu vi của mảnh đất hình chữ nhật là:
\(48\div2=24\left(m\right)\)
Nếu chiều dài giảm 5 và chiều rộng tăng 5 thì chiều dài hơn chiều rộng 2 m
\(\Rightarrow\) Chiều dài hơn chiều rộng 12 m
Chiều dài của mảnh đất hình chữ nhật là:
\(\left(24+12\right)\div2=18\left(m\right)\)
Chiều rộng của mảnh đất hình chữ nhật là:
\(18-12=6\left(m\right)\)
Diện tích của mảnh đất hình chữ nhật là:
\(18\times6=108\left(m^2\right)\)
Đáp số : \(108m^2\)
Gọi a là chiều dài mảnh đất, b là chiều dài mảnh đất. Diện tích hình chữ nhật là axb.
Ta có (a+5)x(b-5)=axb-5xa+5xb-25
=>axb-axb+5xa-5xb+25=225
5xa-5xb+25=225
5xa-5xb=225-25
5xa-5xb=200
(a-b)=200:5
a-b=40.
Nửa chu vi hình chữ nhật: 220:2=110 m.
Chiều dài hình chữ nhật: (110+40)/2=75m
Chiều rộng hình chữ nhật: 75-40=35m
Diện tích mảnh đất ban đầu: 75x35=2625m2
Đáp số: 2625m2
Nữa chu vi
258 :2 = 129
chiều dài hơn chiều rộng
7+14 =21
Chiều dài
(129 +21 )=75
Chiều rộng
75 -21 = 54
Diện tích
75 x54 = 4050m2
tổng số đo chìu dài + rộng là: 960 / 2= 480 m
=> chiều dài hơn CR: 45 + 55 = 100 m
chiều dài: (480 + 100 ) : 2= 290 m
CR : 480 - 290 = 190
S mảnh đất đó là: 290 nhân 190 = 55100 m2
ĐS:55100 m2
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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