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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}
=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