\(\Leftrightarrow n^5+n^2-n^2+1⋮n^3+1\)

\(\Leftrightarrow-n^3+n⋮n^3+1\)

\(\Leftrightarrow n=1\)

N.

2. Mexico City is smaller than Tokyo, but New York is the smallest.

3. New York is wetter than Mexico City, but Tokyo is the wettest.

4. New York is drier than Tokyo, but Mexico City is the driest.

5. Tokyo is cheaper than New York, but Mexico City is the cheapest.

6. Tokyo is more expensive than Mexico City, but New York is the most expensive.

7. Mexico City is hotter than New York, but Tokyo is the hottest.

8. Mexico City is colder than Tokyo, but New York is the coldest.

9. New York is cleaner than Mexico City, but Tokyo is the cleanest.

10. New York is more polluted than Tokyo, but Mexico City is the most polluted.

O.

2. London is as warm as Edinburg.

3. London is not as cloudy as Edinburg.

4. Edinburg isn't as bright as London.

5. London isn't as wet as Edinburg.

a: Trên tia Ax, ta có: AM<AN

nên điểm M nằm giữa hai điểm A và N

b: MN=AN-AM=2cm<AM

c: M không là trung điểm của AN vì AM<>MN

Bài 5.

Ta có: \(\widehat{DAB}=\widehat{CBA}\) 

          \(\widehat{ADC}=\widehat{BCD}\) ( tính chất hình thang cân )

\(\Rightarrow\widehat{DAB}+\widehat{BCD}=180^0\)

\(\Rightarrow\) Hình thang cân ABCD nội tiếp

152 + (-173) - (-18) - 127 

= 152 + (-173) + 18 - 127

= (152 + 18) + (-173) - 127

= 170 + (-300)

= -130

\(152+\left(-173\right)-\left(-18\right)-127\)

\(=\left(152+18\right)-\left(173+127\right)\)

\(=170-300=-130\)

152+(-173)-(-18)-127

=152-173+18-127

=(152+18)-(173+127)

=170-300

=-130