Nguyễn Anh Thư
09/03/2017 at 22:08
Call the long bottom is a
short bottom is b
We have :
\(S=\left(\dfrac{a+b}{2}\right).9=86.4cm^2\) and b = \(\dfrac{1}{2}a\)
Change b to S , we have :
\(\dfrac{a+\dfrac{1}{2}a}{2}.9=86.4\)
\(\dfrac{\dfrac{3}{2}a}{2}=9.6\)
\(\dfrac{3}{2}a.\dfrac{1}{2}=\dfrac{3}{4}a=9.6\)
\(\Rightarrow a=12.8\)
=> b = 6.4

FA FIFA Club World Cup 2018 16/01/2018 at 22:02
Call the long bottom is a
short bottom is b
We have :
S=(a+b2).9=86.4cm2
and b = 12a
Change b to S , we have :
a+12a2.9=86.4
32a2=9.6
32a.12=34a=9.6
⇒a=12.8
=> b = 6.4

demo acc 10/03/2017 at 14:47
perfect

Vũ Thị Hương Giang 09/03/2017 at 22:09
Total double bottom length is:
86.4 x 2: 9 = 19.2 (cm)
The sum of the equal parts is:
1 + 2 = 3 (part)
The big bottom is:
19.2: 3 x 2 = 12.8 (cm)
Baby bottom is:
19.2  12.8 = 6.4 (cm)