a) x = 15

b) x = 11

c) x = 68

d) x = 310

(x4)3=x6x19

a) x = 15.              b)      x = 11.        c) x = 68.              d) x = 310

Tìm xx biết:    \left(x^{4}\right)^{3}=\dfrac{x^{19}}{x^{6}}(x4)3=x6x19​

Trả lời: x=x= 

10 = 2+7+1

25=5x6-5

50=5x8+10

    10 = 2 + ..`9`. - 1                              35 = 5 x ..`8`. - 5                                   50 = 5 x 8 + .`10`..

cái gì đấy lỗi à

lỗi

Lỗi rồi nha! -_-

b) 45^2+45.55

=45.45+45.55

=45.(45+55)

=45.100=4500

TÌM X

gọi A=1+5+5^2+....+5^100

=> 5A=5+5^3+...+5^101

=>5A-A= 5^101-1

=>4A= 5^101-1

=>A= 5^101-1:4

 TUI ĐANG VỘI NÊN CHỈ GIÚP ĐƯỢC ĐẾN ĐÂY. NHƯNG BÀI TUI LÀM ĐÚNG CHUẨN LUÔN ĐẤY!

giúp mình vs

TUI GIẢI TIẾP NHA!

194.12+6.437.2+3.469.4

=12.194+12.437+12.469

=12.(194+437+469)

=12.1100

=13100

CHO TUI HỎI CHÚT DẤU NGOẶC NHỌN TRONG PHẦN TÌM X CHỈ NGOẶC THÔNG THƯỜNG HAY DẤU PHẦN LẺ?

\(5^{10}:5^8+x=3^{20}:\left(-3\right)^{18}-2^{35}:\left(-2\right)^{33}\\ \Leftrightarrow5^2+x=3^2+\left(-2\right)^2\\ \Leftrightarrow25+x=13\\ \Leftrightarrow x=-12\)

5^10/5^8+x=3^20/(-3)^18-2^35/(-2)^33

5^2+x=(-3)^2+2^2

25+x= 9+4

25+x=13

      x=13-25

     x=-12

vậy x=-12

Đáp số:

a) x=15

b) x=11

c) x=68

d) x=310

(x-3.5).12=0

X-15        =0+15

     x         =15

a) x-350=35

x= 35+350=385

b)x-2=5

x=5+2 =3

bạn cố tình ngáo à

a. \(x-\dfrac{2}{35}=\dfrac{-2}{25}\)

<=> \(x=\dfrac{-2}{25}+\dfrac{2}{35}\)

<=> x = \(-\dfrac{4}{175}\)

b. \(\dfrac{11}{12}-\left(x+\dfrac{2}{5}\right)=\dfrac{2}{3}\)

<=> \(\dfrac{11}{12}-x-\dfrac{2}{5}=\dfrac{2}{3}\)

<=> \(-x=\dfrac{2}{3}-\dfrac{11}{12}+\dfrac{2}{5}\)

<=> \(-x=\dfrac{3}{20}\)

<=> \(x=\dfrac{-3}{20}\)

c. \(\dfrac{2}{5}+\dfrac{1}{4}x=\dfrac{-3}{10}\)

<=> \(\dfrac{1}{4}x=\dfrac{-3}{10}-\dfrac{2}{5}\)

<=> \(\dfrac{1}{4}x=\dfrac{-7}{10}\)

<=> \(x=\dfrac{-14}{5}\)

a) \(x-\dfrac{2}{35}=-\dfrac{2}{25}\)

\(\Rightarrow x=-\dfrac{2}{25}+\dfrac{2}{35}\)

\(\Rightarrow x=-\dfrac{4}{175}\)

b) \(\dfrac{11}{12}-\left(x+\dfrac{2}{5}\right)=\dfrac{2}{3}\)

\(\Rightarrow x+\dfrac{2}{5}=\dfrac{11}{12}-\dfrac{2}{3}\)

\(\Rightarrow x+\dfrac{2}{5}=\dfrac{1}{4}\)

\(\Rightarrow x=\dfrac{1}{4}-\dfrac{2}{5}\)

\(\Rightarrow x=-\dfrac{3}{20}\)

c) \(\dfrac{2}{5}+\dfrac{1}{4}x=-\dfrac{3}{10}\)

\(\Rightarrow\dfrac{1}{4}x=-\dfrac{3}{10}-\dfrac{2}{5}\)

\(\Rightarrow\dfrac{1}{4}x=-\dfrac{7}{10}\)

\(\Rightarrow x=-\dfrac{7}{10}:\dfrac{1}{4}\)

\(\Rightarrow x=-\dfrac{14}{5}\)

1> a) \(\frac{5}{7}x4:\frac{5}{9}=\frac{5}{7}:\frac{5}{9}x4=\frac{5}{7}x\frac{9}{5}x4=\frac{9}{7}x4=\frac{9x4}{7}=\frac{36}{7}\)

\(b,8x\frac{2}{3}:\frac{1}{2}=8x\frac{2}{3}x\frac{2}{1}=8x2x\frac{2}{3}=16x\frac{2}{3}=\frac{32}{3}\)

\(c,6:\frac{3}{5}-\frac{7}{6}x\frac{6}{7}=6x\frac{5}{3}-1=10-1=9\)

\(\frac{21}{5}x\frac{10}{11}+\frac{57}{11}=\frac{42}{11}+\frac{57}{11}=\frac{99}{11}=9\)

2) a) \(\frac{35}{9}:x=\frac{35}{6}\)

\(x=\frac{35}{9}:\frac{35}{6}\)

\(x=\frac{35}{9}x\frac{6}{35}\)

\(x=\frac{2}{3}\)

b) \(\left(\frac{1}{1x2}+\frac{1}{2x3}+\frac{1}{3x4}+\frac{1}{4x5}+\frac{1}{5x6}\right)x10-X=0\)

\(\left(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+.....+\frac{1}{5}-\frac{1}{6}\right)x10-X=0\)

\(\left(\frac{1}{1}-\frac{1}{6}\right)x10-X=10\)

\(\frac{5}{6}x10-X=0\)

\(X=\frac{5}{6}x10=\frac{25}{3}\)

Đúng nha !!!!

1/a/\(\frac{5}{7}\cdot4:\frac{5}{9}=\frac{20}{7}:\frac{5}{9}=\frac{20}{7}\cdot\frac{9}{5}=\frac{36}{7}\)

b/\(8\cdot\frac{2}{3}:\frac{1}{2}=\frac{16}{3}:\frac{1}{2}=\frac{16}{3}\cdot\frac{2}{1}=\frac{32}{3}\)

c/\(6:\frac{3}{5}-\frac{7}{6}\cdot\frac{6}{7}=6\cdot\frac{5}{3}-1=10-1=9\)

2/a/\(\frac{35}{9}:x=\frac{35}{6}\)

\(x=\frac{35}{9}:\frac{35}{6}=\frac{35}{9}\cdot\frac{6}{35}\)

\(x=\frac{2}{3}\)

b/\(\left(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}\right)\cdot10-x=0\)

\(\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}\right)\cdot10-x=0\)

\(\left(\frac{30}{60}+\frac{10}{60}+\frac{5}{60}+\frac{2}{30}\right)\cdot10-x=0\)

\(\frac{47}{60}\cdot10-x=0\)

\(\frac{47}{6}-x=0\)

\(x=\frac{47}{6}-0\)

\(x=\frac{47}{6}\)

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