giup toi voi toi dang cân gâp
ae giup toi voi ae oiiiiiiiiiiiiiiii, dang can gap
48.
Gọi O là giao của Ax với BC. Xét tg ABO có
\(\widehat{OAB}=\widehat{xAO}-\widehat{xAB}=180^o-140^o=40^o\)
\(\widehat{OBA}=\widehat{CBO}-\widehat{ABC}=180^o-70^o=110^o\)
\(\Rightarrow\widehat{AOB}=180^o-\left(\widehat{OAB}+\widehat{OBA}\right)=180^o-\left(40^o+110^o\right)=30^o\)
\(\Rightarrow\widehat{yCB}+\widehat{AOB}=150^o+30^o=180^o\) hai góc này nằm ở vị trí 2 góc trong cùng phía và bù nhau => Ax//Cy
49.
Nối A với C. Xét tg ABC có
\(\widehat{BAC}+\widehat{BCA}+\widehat{B}=180^o\)
Ta có
\(\widehat{A}+\widehat{B}+\widehat{C}=360^o\)
\(\Rightarrow\widehat{xAC}+\widehat{BAC}+\widehat{B}+\widehat{yCA}+\widehat{BCA}=360^o\)
\(\Rightarrow\left(\widehat{xAC}+\widehat{yCA}\right)+\left(\widehat{BAC}+\widehat{BCA}+\widehat{B}\right)=360^o\)
\(\Rightarrow\widehat{xAC}+\widehat{yCA}=360^o-\left(\widehat{BAC}+\widehat{BCA}+\widehat{B}\right)=\)
\(=360^o-180^o=180^o\)
Hai góc \(\widehat{xAC}\) và \(\widehat{yCA}\) ở vị trí 2 góc trong cùng phía và bù nhau
=> Ax//Cy
So sanh cac luy thu sau :
a)2^300 va 3^200
b)2^75 va 243^3
c)3333^4444 va 4444^3333
giup toi voi toi dang gap
Chung toi dinh dang tai khoan cua ban voi Kien NT la sao vay ? Tui lap nick moi ma sao bay gio moi thu deu giong kien nt la sao ai giup voi
Cho F(x)=a*x^3+b*x^2+c*x+d, trong do a,b,c,d la hang so va thoa man b=3a+c Chung to rang f(1)=f(-2)
Toi dang on thi hoc ki -Giup toi voi thank you very much
Cho F(x)=a*x^3+b*x^2+c*x+d, trong do a,b,c,d la hang so va thoa man b=3a+c Chung to rang f(1)=f(-2)
Toi dang on thi hoc ki -Giup toi voi thank you very much
15 phut =..................gio. phan so toi gian thichp hop dien vao cho trong la
a1/4 b1/2 c3/12 d 2/3
GIUP MINH VOI MINH DANG CAN GAP
1 chu vit troi dang bay gap 1 dan viyt troi noi chao 100 ban vit .vit dau dan dap chao nhung chung ban nham roi chung toi co so chung toi cong voi so vhung toi cong voi mot nua chung toi cong voi 1/4 va cong voi ban nua . hay tinh so vit troi ?
so con vi co la
1+1+1/2+1/4=100-1=99=99:1/4=36
co mot con vit dang boi,sau do gap mot con ca sau .hoi tai sao con vit no quay vao bo dc
cac ban giup toi voi
con vịt quay vào bờ được là vì nó bơi thôi
Giup toi voi
\(=\dfrac{-4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}=-1-1=-2\)
\(\left(\dfrac{-4}{15}-\dfrac{18}{19}\right)-\left(\dfrac{20}{19}+\dfrac{11}{15}\right)\)
\(=\dfrac{-4}{15}-\dfrac{18}{19}-\dfrac{20}{19}-\dfrac{11}{15}\)
\(=\left(\dfrac{-4}{15}-\dfrac{11}{15}\right)-\left(\dfrac{18}{19}+\dfrac{20}{19}\right)\)
\(=-1-2\)
\(=-3\)
(\(\dfrac{-4}{15}\)-\(\dfrac{18}{19}\))-(\(\dfrac{20}{19}\)+\(\dfrac{11}{15}\))
=\(\dfrac{-4}{15}\)- \(\dfrac{18}{19}\)\(\dfrac{20}{19}\)- \(\dfrac{11}{15}\)
=\(\dfrac{-4}{15}\) -\(\dfrac{11}{15}\) - \(\dfrac{18}{19}\)- \(\dfrac{20}{19}\)
=\(\dfrac{-15}{15}\)-\(\dfrac{-38}{19}\)
=-1 -2
=-3