( x + 1 ) . 2000 = 4000

x + 1 = 4000 : 2000 = 2

x = 2-1

x= 1

It so good for me in the future , thanks you :))

She spent in all : 18,03 + 19,94 = 37.97 ( dollars )

......

mình nha

Ta có : 

\(\dfrac{2}{3}+\dfrac{m}{4}+\dfrac{n}{6}=6\Rightarrow\dfrac{m}{4}+\dfrac{n}{6}=5\dfrac{1}{3}\)

=> m/4 = 2/6 = 2/3

m/4 = 16/3 : ( 3+2 ) x 2 = 32/15

n/6 = 16/3-32/15 = 16/5

=> m x n = 32 x 16 = 512

A =1/3+1/6+1/10+....+1/5050

A \(\times\)1/2= 1/6+1/12+1/20+....+1/10100

A\(\times\)1/2=1/2\(\cdot\)3 + 1/3\(\cdot\)4 + 1/4\(\cdot\)5 + .... +1/100\(\cdot101\)

\(A\cdot\dfrac{1}{2}=\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+...+\dfrac{1}{100}-\dfrac{1}{101}\)

A = ( \(\dfrac{1}{2}-\dfrac{1}{101}\)) :1/2

A = 99/202 : 1/2

A = 99/101