Giúp mình làm này với nha
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Bài 5:
Ta có : \(\widehat{A_1}+\widehat{A_3}=180^o\) (kề bù)
\(100^o+\widehat{A_3}=180^o\)
\(\widehat{A_3}=80^o\)
Ta có: \(\widehat{A_3}=\widehat{B_1}=80^o\)
\(\widehat{A_3}\) và \(\widehat{B_1}\) ở vị trí đồng vị
\(\Rightarrow AC//BD\)
\(\Rightarrow\widehat{C}_1=\widehat{D_1}=135^o\) (đồng vị)
\(x=135^o\)
b)
Ta có: \(\widehat{G_1}+\widehat{B_1}=180^o\left(120^o+60^o=180^o\right)\)
\(\widehat{G_1}\) và \(\widehat{B_1}\) ở vị trí trong cùng phía
\(\Rightarrow QH//BK\)
\(\Rightarrow\widehat{H_1}=\widehat{K_1}=90^o\)(so le)
\(x=90^o\)
Today, I will tell you some things to make school greener-cleaner. Firstly, I will ask everyone not to throw rubbish in the school because it is the reason of air pollution. Secondly, I will advise everyone to plant trees and flowers in the school yard. Thirdly, I will ask my teacher to celebrate many activities to protect the environment. Finnaly, I will advise everyone not to damage trees and flowers.... If everyone try to protect the environment, the school will be greener.
- plant some trees
- don't throw trash on the street
- plant some flowers
- don't damage trees
- don't pick flowers
Mẫu ví dụ của mình. Chúc bạn học tốt !
a, \(\dfrac{2^3-x^3}{x\left(x^2+2x+4\right)}\) = \(\dfrac{\left(2-x\right)\left(x^2+2x+4\right)}{x\left(x^2+2x+4\right)}\) = \(\dfrac{2-x}{x}\)=\(\dfrac{x-2}{-x}\)(đpcm)
b, \(\dfrac{-3x\left(x-y\right)}{y^2-x^2}\) (\(x\) \(\ne\) \(\pm\) y)
= \(\dfrac{-3x\left(x-y\right)}{\left(y-x\right)\left(y+x\right)}\)
= \(\dfrac{3x\left(y-x\right)}{\left(y-x\right)\left(y+x\right)}\)
= \(\dfrac{3x}{x+y}\) (đpcm)
Program HOC24;
var st,st1,st2: string;
i,n,d,k,j: integer;
t,m: longint;
a: array[1..10000] of integer;
f: text;
const fi='SUBSUM.INP' ;
fo = 'SUBSUM.OUT' ;
Procedure ip;
begin
assign(f,fi);
reset(f);
readln(f,n,m);
for i:=1 to n do read(f,a[i]);
close(f);
end;
Procedure out;
begin
assign(f,fo);
rewrite(f);
d:=0;
for i:=1 to n-1 do
Begin
If a[i]=m then d:=d+1;
for j:=i+1 to n do
begin
t:=0;
for k:=i to j do t:=t+a[k];
if t=m then d:=d+1;
end;
End;
if a[n]=m then d:=d+1; write(f,d);
close(f);
end;
Begin
ip;
out;
End.