|3x-2| = |(-7)+3|

|3x-2| = | -4|

|3x-2| = 4

TH1: 3x-2 = 4 

3x =4+2

3x =6

x= 6:3

x= 2

TH2: 3x-2= -4

3x= -4+2

3x= -2

x= -2 :3

x= -2/3

Vậy...

Hk biết có j sai hk nữa

\(x=-2\)

\(\left|x+3\right|+\left|x+5\right|=4x\)

\(\left|x+3\right|+\left|x+5\right|=\left|x+5\right|+\left|x+3\right|\)

\(\left|x+5\right|+\left|x+3\right|=4x\)

\(\Rightarrow x=4\)

vì -99 < 0

98 > 0

-97<0

=> (-99).98.(-97) > 0 ( âm . âm = dương ) 

studywell 

a)

( -99) .98 .(-97)

=  - 9702 .(-97)

=941094

Vì 941094 > 0 nên.....

Vậy...

1)\(10-2\left(4-3x\right)=-4\)

\(\Rightarrow2\left(4-3x\right)=10-\left(-4\right)\)

\(\Rightarrow2\left(4-3x\right)=14\)

\(\Rightarrow4-3x=7\)

\(\Rightarrow3x=-3\)

\(\Rightarrow x=-1\)

Vậy x=-1

2)???? 

3)\(24:\left(3x-2\right)=-3\)

\(\Rightarrow3x-2=-8\)

\(\Rightarrow3x=-6\)

\(\Rightarrow x=-2\)

Vậy x=-2

4)\(-45:5\left(-3-2x\right)=3\)

\(\Rightarrow5\left(-3-2x\right)=-15\)

\(\Rightarrow-3-2x=-3\)

\(\Rightarrow2x=0\)

\(\Rightarrow x=0\)

Vậy x=0

_Học tốt_

\(-(-4^2).3^2.(-5)^3\)

\(=-(-16).9.(-125)\)

\(=16.9.(-125)\)

\(=-18000\)

_Học tốt_

\(A=\frac{1}{1\cdot2}+\frac{1}{3\cdot4}+\frac{1}{5\cdot6}+...+\frac{1}{99\cdot100}\)

\(A=1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{99}-\frac{1}{100}\)

\(A=\left(1+\frac{1}{3}+\frac{1}{5}+...+\frac{1}{99}\right)-\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+...+\frac{1}{100}\right)\)

\(A=\left(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{100}\right)-2\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+...+\frac{1}{100}\right)\)

\(A=1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{100}-1-\frac{1}{2}-\frac{1}{3}-...-\frac{1}{50}\)

\(A=\frac{1}{51}+\frac{1}{52}+\frac{1}{53}+...+\frac{1}{100}\) 

Cảm ơn bạn Uyên nhiều nha!

^_^^_^^_^