Toán 5

T

thien7202

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K

kimnguyen_1997

theo đề, ta có:
a-b = 19,5 *
[TEX]\frac{3}{400}. a = \frac{3}{5}. b[/TEX]
[TEX]\Rightarrow a= \frac {400b}{5}[/TEX]
thay vào * ta có:
[TEX]\frac{400b}{5} - b = 19.5[/TEX]
[TEX]\Rightarrow b= \frac{39}{158} \Rightarrow a=\frac{390}{79}[/TEX]
_____________:O)
 
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