0,a + 0,0b + 0,00c = \(\frac{1}{a+b+c}\)
0,abc = \(\frac{1}{a+b+c}\)
0,0a + 0,0b + 0,00c = 1/ a + b + c
hay 0,abc = 1/ a + b + c
abc / 1000 = 1/a + b + c
abc /1000 = abc / abc x ( a + b + c )
hay abc x ( a+ b +c ) = 1000
ta co :
1000 = 500 x 2 ; 1000 = 250 x 4 ; 1000 = 200 x 5
1000 = 125 x 8 ; 100 x 10
va phai chon a,b,c khac nhau va khac 0 nen ta chi xet truong hop :
1000 = 125 x 8
vay abc x ( a + b +c ) = 125 x 8
hay abc = 125 : a + b + c = 8
vay a = 1 , b = 2 , c = 5
thay vao de bai ta co : 0,1 + 0 ,02 + 0,005 = 1/ 1 + 2 + 5
vay abc = 125
k nha
