48 * x - x + 53 * x = 7900

,=> x *( 48 - 1 + 53 ) = 7900 

=>  x * 100 = 7900

=> x = 7900 : 100 

=> x = 79

Vậy x = 79

48 x X - X + 53 x X = 7900

48 x X - X x 1 + 53 x X = 7900

X x ( 48 - 1 + 53 )         = 7900

X x 100                         = 7900

X                                   = 7900 : 100

X                                   = 79.

Vậy X = 79.

Hok tốt !

\(48.x-x+53.x=7900\)

\(100x=7900\)

\(x=79\)

câu trả lời chính xác tớ k cho cậu rồi nha

Kết quả là 7900000

Nhớ tk mình nha =))

7900 x 120+ 7900 x 380 + 7900 x 500 

 = 7900 x ( 120 + 380 + 500 )

= 7900 x 1000

= 7900000

Thanh lý nick này, ai cần xin liên hệ

7900x120+7900x380+7900x500

=7900x(120+380+500)

=7900x(500+500)

=7900x1000

=7900000

\(x\times92+x\times7+x=7900\)

\(\Rightarrow x\times\left(92+7+1\right)=7900\)

\(\Rightarrow x\times100=7900\)

\(\Rightarrow x=7900:100\)

\(\Rightarrow x=79\)

X x 92 + X x 7 + X = 7900

X x 92 + X x 7 + X x 1 = 7900

X x ( 92 + 7 + 1 ) = 7900

X x  100 = 7900

X = 7900 : 100

X = 79

​N * 5 + N * 9 + N * 28 - N * 33 = 7900

​N * ( 5 + 9 + 28 - 33 ) = 7900

N * 9 = 7900

​N = 7900 : 9

Tick nha

N x 5 + N x 9 + N x 28 - N x 33 = 7900

N x ( 5 + 9 + 28 - 33 ) = 7900

N x 9 = 7900

N = 7900 : 9

N = đề sai

N*5+N*9+N*28-N*33=7900

N*(5+9+28-33)=7900

N*9=7900

N=7900:9

N=877,7777778

tick nha

a) \(\left(145\times99+145\right)-\left(143\times102-143\right)\)

\(=\left[145\times\left(99+1\right)\right]-\left[143\times\left(102-1\right)\right]\)

\(=\left(145\times100\right)-\left(143\times101\right)\)

\(=14500-14443\)

\(=57\)

b) \(54\times47-47\times53-20-27\)

\(=47\times\left(54-53\right)-20-27\)

\(=47-20-27\)

\(=0\)

c) \(10000-47\times72-47\times28\)

\(=10000-47\times\left(72+28\right)\)

\(=10000-47\times100\)

\(=10000-4700\)

\(=5300\)

d) \(3457-27\times48-48\times73+6543\)

\(=\left(3457+6543\right)-48\times\left(27+73\right)\)

\(=10000-48\times100\)

\(=10000-4800\)

\(=5200\)

Ta có : \(\dfrac{x-50}{50}+\dfrac{x-51}{49}+\dfrac{x-52}{49}+\dfrac{x-53}{47}+\dfrac{x-200}{25}=0\)

\(\Leftrightarrow\dfrac{x-50}{50}-1+\dfrac{x-51}{49}-1+\dfrac{x-52}{49}-1+\dfrac{x-53}{47}-1+\dfrac{x-200}{25}+4=0\)

\(\Leftrightarrow\dfrac{x-100}{50}+\dfrac{x-100}{49}+\dfrac{x-100}{49}+\dfrac{x-100}{47}+\dfrac{x-100}{25}=0\)

\(\Leftrightarrow\left(x-100\right)\left(\dfrac{1}{50}+\dfrac{1}{49}+\dfrac{1}{48}+\dfrac{1}{47}+\dfrac{1}{25}\right)=0\)

<=> x - 100 = 0

<=> x = 100

Vậy ..

Ta có: \(\dfrac{x-50}{50}+\dfrac{x-51}{49}+\dfrac{x-52}{48}+\dfrac{x-53}{47}+\dfrac{x-200}{25}=0\)

\(\Leftrightarrow\dfrac{x-50}{50}-1+\dfrac{x-51}{49}-1+\dfrac{x-52}{48}-1+\dfrac{x-53}{47}-1+\dfrac{x-200}{25}+4=0\)

\(\Leftrightarrow\dfrac{x-100}{50}+\dfrac{x-100}{49}+\dfrac{x-100}{48}+\dfrac{x-100}{47}+\dfrac{x-100}{25}=0\)

\(\Leftrightarrow\left(x-100\right)\left(\dfrac{1}{50}+\dfrac{1}{49}+\dfrac{1}{48}+\dfrac{1}{47}+\dfrac{1}{25}\right)=0\)

mà \(\dfrac{1}{50}+\dfrac{1}{49}+\dfrac{1}{48}+\dfrac{1}{47}+\dfrac{1}{25}>0\)

nên x-100=0

hay x=100

Vậy: S={100}