x=1000

3xy = x

=> 3y = 1

=> y = \(\frac{1}{3}\), x \(\in\)Z

15000 nhé bn

9000 + 1000 + 1000

= 10000 + 1000

=11000

kb voi minh nhe thanh you

a) 

\(3,2x+\left(-1,2\right)x+2,7=-4,9\)

\(\Rightarrow x\left(3,2+-1,2\right)=-7,6\)

\(\Rightarrow x=-3,8\)

Vậy \(x=-3,8\)

b)

\(\left(-5,6\right)x+2,9x-3,86=-9,8\)

\(\Rightarrow x\left(-5,6+2,9\right)=-5,94\)

\(\Rightarrow x=2,2\)

Vậy \(x=2,2\)

( 4x + 5) : 3 - 12 : 11 = 4

( 4x + 5) : 3 - 12 = 4 x 11 = 44

( 4x + 5) : 3 = 44 + 12 = 56

4x + 5 = 56 x 3 = 168

4x = 168 - 5 = 163

x = 163 : 4

x = ....

< Đề sai thì phải >

la 123

A = 35.53-18

=(34+1).53-18

=34.53+35

=> A=B

27^16:9^10=(3^3)^16:(3^2)^10=3^48:3^20=3^28