a, <=> 2,5 : 4x = 2,5
<=> 4x = 2,5 : 2,5 = 1
<=> x=1 : 4 = 1/4
b, <=> 1/5.x:3 = 8/3
<=> 1/5.x = 8/3 . 3 = 8
<=> x = 8 : 1/5 = 40
cai lon me may
a)2,5:4x=0,5:0,2
2,5:4x=2,25
4x=2,5:2,25
4x=\(\frac{10}{9}\)
x=\(\frac{10}{9}\):4
x=\(\frac{10}{9}\).\(\frac{1}{4}\)
x=\(\frac{5}{18}\)
Vậy x=\(\frac{5}{18}\)
b)\(\frac{1}{5}\)x:3=\(\frac{2}{3}\):0,25
\(\frac{1}{5}\)x:3=\(\frac{2}{3}\):\(\frac{1}{4}\)
\(\frac{1}{5}\)x:3=\(\frac{8}{3}\)
\(\frac{1}{5}\)x=\(\frac{8}{3}\).3
0,2x=8
x=8:0,2
x=40
Vậy x=40
a)2,5:4x=0,5:0,2
2,5:4x=2,5
4x=2,5:2,5
4x=1
x=1:4
x=\(\frac{1}{4}\)
Vậy x=\(\frac{1}{4}\)