Câu 1: 

Dùng for..do

uses crt;

var a,i:integer;

begin

clrscr;

a:=0;

for i:=1 to 100 do 

  if i mod 2=0 then a:=a+i;

writeln(a);

readln;

end.

Dùng While...do

uses crt;

var a,i:integer;

begin

clrscr;

a:=0;

i:=1;

while i<=100 do 

  begin

if i mod 2=0 then a:=a+i;

inc(i);

end;

writeln(a);

readln;

end.

1.A
2.A
3.B
4.C
5.B
6.C
7.A
8.A
9.B
10.A
11.B
12.A
13.C
14.B
15.B
16.A
17.A
18.A
19.A
20.C

1. I do not have any money in my bag.

2. They did their homework carefully.

3. My bed is more comfortable than that one.

4. There weren't any students in the classroom yesterday.

5. The red flowers are the most beautiful.

6. Minh was late because his bike broke yesterday.

7. Lili's sister is afraid of tigers and lions.

8. Does Tony always read comic books in the evening?

1. I do not have any money in my bag.

2. They did their homework carefully.

3. My bed is comfortable more than that one.

4.There weren't any students in the classroom yesterday.

5. The red flowers are the most beautiful.

6. Minh was late because his bike broke yesterday.

7. Lili's sister is afraid of tigers and lions.

8. Does Tony always read comic books in the evening?

Học tốt

a, \(\dfrac{2x-3}{-5}>\dfrac{x-2}{-3}\) 

<=> \(\dfrac{2x-3}{-5}.-15< \dfrac{x-2}{-3}.-15\)

<=> 3(2x - 3) < 5(x - 2)

<=> 6x - 9 < 5x - 10

<=> x < -1 S = {x|x<-1}

b, \(\dfrac{x-2}{6}-\dfrac{x-1}{3}\le\dfrac{x}{2}\)

<=> \(\dfrac{x-2}{6}-\dfrac{2x-2}{6}\le\dfrac{3x}{6}\)

<=> x - 2 - 2x + 2 \(\le\) 3x

<=> -x\(\le\) 3x

<=> 2x \(\le\) 0

<=> x \(\le\) 0 S = {x|x\(\le\)0}

c,\(2+\dfrac{3\left(x+1\right)}{3}< 3-\dfrac{x-1}{4}\)

<=> 2 + x + 1 < 3 - \(\dfrac{x-1}{4}\) 

<=> 12 + x < 12 - x + 1

<=> 2x < 1

<=> x < \(\dfrac{1}{2}\) S = {x|x<\(\dfrac{1}{2}\)}

d,\(5+\dfrac{x+4}{5}< x-\dfrac{x-2}{2}+\dfrac{x+3}{3}\)

<=> \(\dfrac{150}{30}+\dfrac{6x+24}{30}< \dfrac{30x}{30}-\dfrac{15x-30}{30}+\dfrac{10x+30}{30}\)

<=> 150 + 6x + 24 < 30x - 15x + 30 + 10x + 30

<=> 114 < 19x

<=> x > 6 S = {x|x>6}

viết lại đi lắn nót vào mới đọc được và hiểu được để mà trả lời chứ viết rõ chữ vào đừng viết tắt

=57.(157-98-57):57 (bn đặt thừa số chung nhé)

=157-98-57=2 (sai thôi nhé mk ko bấm máy)

=\(=\frac{57\left(157-98-57\right)}{57}=2\)

Xét : \(\frac{a}{5}=\frac{12}{144}\Leftrightarrow a=\frac{5}{12}\)

Xét : \(\frac{b}{3}=\frac{12}{144}\Leftrightarrow b=\frac{1}{4}\)

Xét ; \(\frac{c}{8}=\frac{12}{144}\Leftrightarrow c=\frac{2}{3}\)

Ta có 

\(\hept{\begin{cases}\frac{a}{5}=\frac{12}{144}\\\frac{b}{3}=\frac{12}{144}\\\frac{c}{8}=\frac{12}{144}\end{cases}}\Leftrightarrow\hept{\begin{cases}a=5.12:144=\frac{5}{12}\\b=3.12:144=\frac{1}{4}\\c=8.12:144=\frac{2}{3}\end{cases}}\)

vậy a=5/12 và b=1/4 và c=2/3

đăng dài vậy ít người làm lắm

mà bạn phải tự đặt phép tính hàng dọc chứ

Làm giúp mik nốt 5 câu cuối không cần làm hàng dọc cx đc