\(B=\frac{36}{1.3.5}+\frac{36}{3.5.7}+\frac{36}{5.7.9}+...+\frac{36}{25.27.29}\)

   \(=9.\left(\frac{4}{1.3.5}+\frac{4}{3.5.7}+\frac{4}{5.7.9}+...+\frac{4}{25.27.29}\right)\)

    \(=9.\left(\frac{1}{1.3}-\frac{1}{3.5}+\frac{1}{3.5}-\frac{1}{5.7}+\frac{1}{5.7}-\frac{1}{7.9}+...+\frac{1}{25.27}-\frac{1}{27.29}\right)\)

    \(=9.\left(\frac{1}{3}-\frac{1}{675}\right)\)

    \(=9.\frac{224}{675}\)

    \(=\frac{224}{75}\)

THIẾU

\(=\frac{224}{75}< \frac{225}{75}=3\)

Vậy \(B< 3\)

mấy bọn nguuuuuuuuuuuuuuuuuu

5.x - 9 = 5 + 3.x

5x - 3x = 5 + 9

2x = 14

x = 14 : 2

x = 7

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(5x + 1)² = 36/49

5x + 1 = 6/7 hoặc 5x + 1 = -6/7

*) 5x + 1 = 6/7

5x = 6/7 - 1

5x = -1/7

x = -1/7 : 5

x = -1/35

*) 5x + 1 = -6/7

5x = -6/7 - 1

5x = -13/7

x = -13/7 : 5

x = -13/35

Vậy x = -13/35; x = -1/35

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2ˣ⁻¹ = 16

2ˣ⁻¹ = 2⁴

x - 1 = 4

x = 4 + 1

x = 5

c, (2\(\times\) \(x\) - 3) \(\times\) 5 = 4

    2 \(\times\) \(x\) - 3       = \(\dfrac{4}{5}\)

     2 \(\times\) \(x\)            = 0,8 + 3

      2\(x\)                = 3,8

        \(x\)                 = \(3,8\) : 2

        \(x\)                 = 1,9 

d, 1 + 3 + 5 +....+\(x\)   = 36

    (\(x\) + 1)\(\times\) \(x\): 2      = 36

     (\(x+1\)) \(\times\)\(x\)         = 72 

     (\(x+1\))\(\times\)\(x\)           = 8 x 9

      \(x\)                         = 8

a) (X - 5) x 4 = 36

⇒         X - 5 = 36 : 4

⇒         X - 5 = 9

⇒              X = 9 + 5

⇒              X = 14

     Vậy X = 14 

b) (48 - X) x 2 = 14

⇒         48 - X = 14 : 2

⇒         48 - X = 7

⇒                X = 48 - 7

⇒                X = 41

    Vậy X = 41

\(x\div36-5=12\)

\(\Rightarrow x\div36=17\)

\(\Rightarrow x=612\)

\(\frac{3}{5}-x+\frac{1}{3}=\frac{1}{4}\)

\(\Rightarrow\frac{3}{5}-x=\frac{-1}{12}\)

\(\Rightarrow x=\frac{41}{60}\)

~Study well~

#Thạc_Trân

a) x:36=12+5

x:36=17

x=17*36

x=12

b3/5-x=1/4-1/3

3/5-x=-1/12

x=3/5-(-1/12)

x=41/60

nhớ k cho mik nha

X : 36 -5 =12

X : 36    = 5+ 12

X: 36     = 17

     X      =  36 x 17

     X      = 612

\(a)x=\dfrac{1}{4}+\dfrac{5}{13}=\dfrac{33}{52}.\\ b)\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}.\\ \Leftrightarrow\dfrac{x}{3}=\dfrac{11}{21}.\\ \Leftrightarrow\dfrac{7x}{21}=\dfrac{11}{21}.\\ \Rightarrow7x=11.\\ \Leftrightarrow x=\dfrac{11}{7}.\\ c)\dfrac{x}{3}=\dfrac{16}{24}+\dfrac{24}{36}=\dfrac{2}{3}+\dfrac{2}{3}=\dfrac{4}{3}.\\ \Rightarrow x=4.\\ d)\dfrac{x}{15}=\dfrac{1}{5}+\dfrac{2}{3}=\dfrac{13}{15}.\\ \Rightarrow x=13.\)

Bạn ghi đề bài phần d) rõ ra hơn nha .

a. 37-7.(x+1)=40-8.3

37 - 7(x+1) = 16 

7(x+1) = 21

x+1 = 3

x=2

b. (x+5).3=11=10+(3+4).4

(sao có 2 dấu bằng, dấu nào là dấu cộng do viết nhầm ???)

c. 25-5.3+4.10=100-5.x

50 = 100 - 5x 

5x = 50

x=10

d. 36+2.(x-7)=12+8.(3+5)-36

36 + 2(x-7) = 40

2(x-7) = 4

x-7 =2

x=9

e. 3.(x+7)-9=11.5-5-8

3(x+7) - 9 = 42 

3(x+7) = 51

x+7 = 17 

x=10