y x 6,5 + y : 2 = 71,4

y x 6,5 + y x 1/2 = 71,4

y x ( 6,5 + 1/2) = 71,4

y x ( 6,5 + 0,5) = 71,4

y x 7 = 71,4

y = 71,4 : 7

y = 10,2

\(y\times6,5+y:2=71,4\\ y\times6,5+y\times\dfrac{1}{2}=71,4\\ y\times6,5+y\times0,5=71.4\\ y\times\left(6,5+0,5\right)=71,4\\ y\times7=71.4\\ y=71,4:7\\ y=10,2\)

dap an 100,7

min cung co giai vang 19

100.7   nhé

Mọi người giúp em với ạ

\(0,125+y.2=18,5\)

    ⇔      \(y.2=18,375\)

    ⇔         \(y=9,1875\)

Theo đề bài, ta có:

x:y:z=2/3:3/5:1/2

=> x/2/3=y/3/5=z/1/2

và x-y=-6,5

Theo tính chất dãy tỉ số bằng nhau, ta có:

x/2/3=y/3/5=x-y/2/3-3/5=-6,5/1/15=-13/30

=> x/2/3=-13/30=>x=-13/30.2/3=-13/45

=>y/3/5=-13/45=>y=-13/45.3/5=-13/75

=>z/1/2=-13/45=>z=-13/45.1/2=-13/90

Vậy x=-13/45 ; y=-13/75 ; z=-13/90

Tick cho mình nha!

x:y:z=2/3:3/5:1/2

=>\(\dfrac{x}{\dfrac{2}{3}}=\dfrac{y}{\dfrac{3}{5}}=\dfrac{z}{\dfrac{1}{2}}\)=\(\dfrac{x-y}{\dfrac{2}{3}-\dfrac{3}{5}}=\dfrac{6,5}{\dfrac{1}{15}}=97,5\)

=>\(\dfrac{x}{\dfrac{2}{3}}=97,5\Rightarrow x=65;\dfrac{y}{\dfrac{3}{5}}=97,5\Rightarrow y=58,5\)

\(\dfrac{z}{\dfrac{1}{2}}=97,5\Rightarrow z=48,75\)

vậy .......

y : 0,125 + y : 0,25 - y x 2 = 300

y x 8 + y x 4 - y x 2 = 300

y x (8 + 4 - 2) = 300

y x 10 = 300

y = 300 : 10

y = 30

y : 0,125 + y : 0,25 - y x 2 = 300

y x 8 + y x 4 - y x 2 = 300

y x (8 + 4 - 2) = 300

y x 10 = 300

y = 300 : 10

y = 30

y/0.04+y*3/2-y*6.5=2014

=>y*(1/0.04)+y*3/2-y*6.5=2014

=>y*(1/0.04+3/2-6.5)=2014

=>y=100.7

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