=10x36,7-36,7=36,7x9=330,3

=10x36,7-36,7=36,7x9=330,3

8 x 36,7 x 1,25 - 36,7 = 330,3

\(=\left(8\times1,25\right)\times\left(36,7-3,7\right)\\ =10\times0=0\)

100% + 28,4% - 36,7% = (100 + 28,4 – 36,7)% = 91,7%

\(\Leftrightarrow x=36,7:8,6\)

\(\Leftrightarrow x\approx4,3\)

x=4,2674418............

\(x\times8,6=36,7\)
\(\Rightarrow x=36,7:8,6\)
\(\Rightarrow x=4\) (dư 2,3)

a) Ta có: \(\dfrac{9}{5}:\dfrac{17}{5}+\dfrac{8}{5}:\dfrac{17}{15}\)

\(=\dfrac{9}{5}\cdot\dfrac{5}{17}+\dfrac{8}{5}\cdot\dfrac{15}{17}\)

\(=\dfrac{9}{17}+\dfrac{24}{17}=\dfrac{33}{17}\)

 a )9/5: 17/5 + 8/5 : 17/15 = 9/5 x 5/17 + 8/5 x 15/17 = 9/17  +24/17=  33/17

b) ?

a, `9/5 : 17/5 + 8/5 : 17/5`

`=(9/5+8/5) : 17/5`

`=17/5 : 17/5`

`=1`

84,02x(36,7+62,3)

=84,02x100

=8402

84,02.36,7+62,3.84,02+84,022

= 84,02.(36,7+62,3)+84,022

=84,02.100+84,022

=8402+84,022

=8486,022

a: =60,6096km²

a,0,23% của 26352km²=60,6073 km²
b,36,7% của 231360ha=84909,12 ha

Phép tính : Chúng ta lấy 26352km² : 100 x 0,23= 60,6073 km²

Phép tính : Chúng ta lấy 231360ha : 36,7%= 84909,12 ha