Question

giúp mk vs nha

mk hơi bị nhác tính hihi

1.tìm x

(x-15): 5+22=24

42 - ( 2x + 32 ) + 12 : 2 = 6

(x -105) :21 =15

x-105 :21=15

( 2x -6 ) -(3x +7 )=0

2.tìm x bt x thuộc N

(x -2)^4 = (x-2)^6

9.3^x = 243

x-1/-2 =-8/x-1

x+3/x-1=1/3

3. tìm số nguyên x,y biết

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

xy-x+y=3

[2x +4 ]^5 + ( 2y -6 )^14 =0

Answer 1

1.tìm x

(x-15): 5+22=24

(x-15): 5=24-22=2.

(x-15)=2.5=10.

x=10+15=25.

42 - ( 2x + 32 ) + 12 : 2 = 6

= 42 - (2x + 32 ) + 6 = 6.

42 - (2x + 32 ) = 6-6=0.

(2x+32) = 42 - 0 = 0.

2x = 0 - 32 = 0.

x = 0 : 2 = 0.

(x -105) :21 =15

(x-105) = 15.21=315.

x = 315 + 105 = 420.

x-105 :21=15

= x - 5 = 15.

x= 15 + 5 = 20.

( 2x -6 ) -(3x +7 )=0

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