Ảnh của vật AB qua gương phẳng = vật AB = 4cm

35 - x - 2 = 37

=> -x = 37 - 35 + 2 

=> -x = 4

=> x = -4

a) 4x - 1 = 3x - 2

<=> 4x - 3x = -2 + 1

<=> x = -1

Vậy S = {-1}

b) x + 1 = 2. (x - 3)

<=> x + 1 = 2x - 6

<=> x - 2x = -6 -1 

<=> -x = -7

<=> x = 7

Vậy:....

c) 2. (x + 1) + 3 = 2 - x

<=> 2x + 2 + 3 = 2 - x

<=> 2x + x = 2 - 2 - 3

<=> 3x = -3

<=> x = -1

Vậy:,,,,

a) (x - 1) - (2x - 1) = 9 - x

<=> x - 1 - 2x + 1 = 9 - x

<=> x - 2x + x = 9 + 1 - 1

<=> 0x = 9 (vô lý vì 0x = 0 với mọi x)

Vậy PT vô nghiệm

b) 3 - 4x. (25 - 2x) = 8x²

<=> 3 - 100x + 8x² = 8x²

<=> 3 - 100x = 0

<=> -100x = -3

<=> 100x = 3

\(\Leftrightarrow x=\dfrac{3}{100}\)

Vậy: \(S=\left\{\dfrac{3}{100}\right\}\)

a) Xét ΔABC và ΔPMN ta có:

AB = PM (GT)

BC = MN (GT)

AC = PN (GT)

=> ΔABC = ΔPMN (c - c - c)

b) ΔABC = ΔPMN (cmt)

=> Góc BAC = Góc MPN (2 góc tương ứng)

A. should

Program mun;

Uses crt;

Var i:integer;

Begin

For i:=1 to 10 do write ('2 × ', i,' = ', 2*i);

Readln;

End.

P/s: Ko chắc ạ!

Program mun;

Uses crt;

Var i:integer;

Begin

For b:=1 to 10 do write ('2 × ', i,' = ', 2*i);

Readln;

End.

P/s: Ko chắc ạ!

1: Last year we spent a week at My Son and I didn't want to leave

2: Watching televison is considered the most popular kind of entertainment nowadays

3:  It is difficult to start looking for a job at his age.

4:  He hopes he’ll have own library.