giả sử chiều dài và chiều rộng ban đầu là 100 cm.
chiều dài sau khi tăng là:
100 + 20 = 120 (cm)
chiều rộng sau khi giảm là:
100 - 20 = 80 (cm)
diện tích đầu là:
100 x 100 = 10000 (cm2)
diện tích sau là:
120 x 80 = 9600 (cm2)
tỉ số phần trăm hình chữ nhật trước và sau là:
9600 : 10000 = 0,96 = 96%
diện tích hình chữ nhật giảm là:
100% - 96% = 4%
đáp số: 4%.
Chiều dài mới bằng:
100% + 20% = 120% (chiều dài cũ)
Chiều rộng mới bằng:
100% - 20% = 80% (chiều rộng cũ)
Diện tích mới bằng:
120% x 80% = 96% (diện tích cũ)
Diện tích hình chữ nhật đó giảm đi:
100% - 96% = 4%
Đáp số: Giảm đi 4%
Giả sử chiều rộng là 1 và chiều dài là 2 , ta có :
Chiều rộng sau khi tăng là :
1 - (1 x 20%) = 0,8
Chiều dài sau khi tăng là :
2 + (2 x 20%) = 2,4
Diện tích ban đầu là :
2 x 1 = 2
Diện tích lúc sau là :
2,4 x 0,8 = 1,92
Tỉ số phần trăm giữa diện tích ban đầu và diện tích lúc sau là :
1,92 : 2 x 100 = 96%
Vậy diện tích giảm đi là :
100% - 96% = 4%
ĐS : 4%
Like mình nha !
Giả sử chiều rộng là 1 và chiều dài là 2 , ta có :
Chiều rộng sau khi tăng là :
1 - (1 x 20%) = 0,8
Chiều dài sau khi tăng là :
2 + (2 x 20%) = 2,4
Diện tích ban đầu là :
2 x 1 = 2
Diện tích lúc sau là :
2,4 x 0,8 = 1,92
Tỉ số phần trăm giữa diện tích ban đầu và diện tích lúc sau là :
1,92 : 2 x 100 = 96%
Vậy diện tích giảm đi là :
100% - 96% = 4%
ĐS : 4%
Nhớ like mình nha ^^
4 LÀ SAI BÉT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
gọi chiều dài là a chiều rộng là b
nếu tăng chiều dài thêm 20% thì chiều dài mới
100%+20%=120% chiều dài cũ hay là 120/100 a
nếu chiều rộng cũ dảm 20% thì chiều rộng mới
100%-20%=80% hay la 80/100 b
diện tích mới = chiều dài mới * chiều dài cũ
diện tích mới là:
=(120/100*b) +(80/100*a) =120+80/100+100 = 96=a*b
tức là diện tích mới bằng 96% diện tích cũ
vậy diện tích mới kém diện tích cũ số phần trăm là :
100%-96%= 4%
Đáp số: 4%
nhớ k cho mik nha
Excuse me, I don't understand Vietnamese so you can swicth to english?
Chiều dài ban đầu là 100%
Chiều rộng ban đầu là 100%
Chiều dài sau khi tăng thêm 20% là 120%
Chiều rộng sau khi giảm đi 20% là 80%
Diện tích HCN ban đầu là : 100% x 100% = 100%
Diện tích HCN mới là : 120% x 80% = 96%
Vậy diện tích HCN sẽ giảm đi : 100% - 96% = 4%
Đ/s : 4%
Chúc bạn học tốt !!!
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