Vì 15 - 0 = 15 

Nên số thứ nhất là :

15 - 0 = 15

Số bé là :

15 - 15 = 0

ĐS : SL : 15

       SB : 0

**** mình nha !

Vì AB//CD(gt)

=> \(\widehat{A}+\widehat{D}=180\)

Có: \(\begin{cases}\widehat{A}-\widehat{D}=40\\\widehat{A}+\widehat{D}=180\end{cases}\)\(\Leftrightarrow\begin{cases}\widehat{A}=40+\widehat{D}\\40+\widehat{D}+\widehat{D}=180\end{cases}\)

\(\Leftrightarrow\begin{cases}\widehat{A}=40+\widehat{D}\\2\widehat{D}=140\end{cases}\)\(\Leftrightarrow\begin{cases}\widehat{A}=40+70=110\\\widehat{D}=70\end{cases}\)

Ví \(\widehat{A}=2\widehat{C}\Rightarrow\widehat{C}=\frac{\widehat{A}}{2}=\frac{110}{2}=55\)

Vì AB//CD(gt)

=> \(\widehat{B}+\widehat{C}=180\Rightarrow\widehat{B}=180-\widehat{C}=180-55=125\)

a) Có: AD vuông góc vs AB

           BC vuông góc vs AB

=> AD//BC

hay a//b

a) Vì a//b(cmt)

=> \(\widehat{ADC}+\widehat{DCB}=180\) (cạp góc trong cùng phía bù nhau)

Hay 120+x=180

=>x=180-120=60

\(\frac{x+1}{2x+1}=\frac{0,5x+2}{x+3}\Rightarrow\left(x+1\right)\left(x+3\right)=\left(0,5x+2\right)\left(2x+1\right)\)

\(\Rightarrow x^2+3x+x+3=x^2+0,5x+4x+2\)

\(\Rightarrow x^2+3x+x-x^2-0,5x-4x=2-3\)

\(\Rightarrow-\frac{1}{2}x=-1\)

\(\Rightarrow x=2\)