Question

Tìm x trong tỉ lệ thức sau

a x : 8,5 = 0,69 : (-1,15) ; \(b\left(0,25x\right):3=\dfrac{4}{5}:0,125\)

Giúp mình với

Answer 1

a)x:8,5=0,69:(-1,15)

(=)x:8,5=-0,6

(=)x=-0,6.8,5

(=)x=-5,1

Vậy x=-5,1

b) (0,25x):3=4/5:0,125

(=)(0,25x):3=6,4

(=)0,25x=6,4.3

(=)0,25x=19,2

(=)x=19,2:0,25

(=)x=76,8

Vậy x=76,8

Answer 2

a,\(x:8,5=0,69\)

\(x=0,69.8,5\)

\(x=5,865\)

b,\(\left(0,25x\right):3=\dfrac{4}{5}:0,125\)

\(0,25x:3=6,4\)

\(0,25x=19,2\)

\(x=76,8\)

Answer 3

a, x: 8,5 = 0,69 : (-1,15)

=\(\dfrac{x}{8,5}\)=\(\dfrac{0,69}{-1,15}\)

\(\Rightarrow\)x= \(\dfrac{8,5\cdot0,69}{-1,15}\)=-5,1

b,(0,25x):3=\(\dfrac{4}{5}\): 0,125

=\(\dfrac{0,25x}{3}\)=\(\dfrac{32}{5}\)

\(\Rightarrow\)0,25x=\(\dfrac{3\cdot32}{5}\)=\(\dfrac{96}{5}\)

\(\Rightarrow\)x=\(\dfrac{96}{5}\): 0,25 =76,8