Xx\(\frac{1}{4}\)+Xx\(\frac{1}{5}\)+Xx2=19,6

XxXxX=19,6:2:\(\frac{1}{5}\):\(\frac{1}{4}\)

Xx3=196

X=196:3

X=\(\frac{196}{3}\)

nhé bạn

\(x.\frac{1}{4}+x.\frac{1}{5}+x.2=19.6\)

\(x.\left(\frac{1}{4}+\frac{1}{5}+2\right)=19,6\)

\(x.2,45=19,6\)

\(x=19,6:2,45\)

\(x=8\)

(Xx1)+(Xx2)+(Xx3)+(Xx4)=50

=>4xX+10=50

=>4xX=50-10

=>4xX=40

=>X=40:10

=>X=4

24

24

24 nhé

77/45

7/6

29/10

\(\dfrac{3}{5}+\dfrac{4}{3}\times\dfrac{5}{6}=\dfrac{3}{5}+\dfrac{10}{9}=\dfrac{27}{45}+\dfrac{50}{45}=\dfrac{77}{45}\)

\(2-\dfrac{7}{6}+\dfrac{1}{3}=\dfrac{12}{6}-\dfrac{7}{6}+\dfrac{2}{6}=\dfrac{7}{6}\)

\(\dfrac{7}{6}\times3-\dfrac{3}{5}=\dfrac{7}{2}-\dfrac{3}{5}=\dfrac{35}{10}-\dfrac{6}{10}=\dfrac{29}{10}\)

giải chi tiết đi

3/15, 3/5, 6/5, 8/5

giúp mình với, đi mà mọi người

3/15; 3/5; 6/5; 8/5

\(a.\dfrac{7}{8}+\dfrac{1}{2}\text{=}\dfrac{11}{8}\)

\(b.\dfrac{5}{6}+\left(-2\right)\text{=}\dfrac{-7}{6}\)

\(c.\dfrac{2}{5}+\dfrac{-3}{8}\text{=}\dfrac{1}{40}\)

\(d.\dfrac{5}{7}-\dfrac{3}{8}\text{=}\dfrac{19}{56}\)

\(e.\dfrac{3}{4}-\dfrac{1}{2}+\dfrac{7}{6}\text{=}\dfrac{17}{12}\)

`a. 7/8 + 1/2 = 7/8 + 4/8=(7+4)/8=11/8`

`b. 5/6 + (-2) =5/6 + (-12/6)=-7/6`

`c. 2/5 + -3/8   = 16/40 + (-15/40)=1/40`

`d. 5/7  - 3/8  = 40/56 - 21/56=19/56`

`e. 3/4 - 1/2 +7/6= 3/4 - 2/4 + 7/6= 1/4 + 7/6= 6/24 + 28/24= 34/24=17/12`

` x xx 1/3 : 2/5 =4/3`

`=> x xx 1/3 = 4/3 xx 2/5`

`=> x xx 1/3 = 8/15`

`=> x= 8/15 :1/3`

`=> x= 8/15 xx 3`

`=> x= 24/15`

`=> x= 8/5`

P=x2−4x+5

  =x2−4x+4+1

  =(x−2)2+1≥1

⇒Pmin=1 khi x=2

=495 giây:5

=99 giây

99 giây