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Đề 1:
Vì `hat(xBy) = 120^o <180^o` và `120^o > 90^o`.
`=>` Đây là góc tù.
Đề 2:
Vì `hat(xBy) = 60^o < 90^o` và `60^o > 0^o`.
`=> hat(xBy)` là góc nhọn.
play badminton,play chess, play volleyball, play soccer,play football,play game, play basketball, play tennis, play hockey, play sword fighting
do yoga, do ballet, do Jodo, do Kungfu, do karate, do aerobic, do weight-lighting, do exercise(mink chỉ lm dc thế thôi)
have lunch, have breakfast, have dinner, have a good day, have a nice day, have fun, have a nice weekend, have got()
cái cuối mink bít
Play
=> Play badminton , play volleyball , play football , play chess , play table tennis , play video game , play basketball , play soccer , play hockey , play skating
Do
=> Do homework , do housework , do aerobic , do ballet , do Judo , do Joga , do Kungfu , do Karate , do weigh - lighting , do exercise
Have
=> Have breakfast , have lunch , have dinner , have fun , have a rest , have a shower , have a party , have relationship , have a baby , have problem
Study
=> Study Maths , study Medical degree , study Group , study report , study room , study contract , study programme , study area , study period , study Feasibility
3 . ( 2x - 1 ) - 2 = 13
3 . ( 2x - 1 ) = 12 + 3
3 . ( 2x - 1 ) = 15
2x - 1 = 15 : 3
2x - 1 = 5
2x = 5 + 1 = 6
x = 6 : 2 = 3
Vậy x = 3
\(3\left(2x-1\right)-2=13\)
\(3\left(2x-1\right)=15\)
\(2x-1=5\)
\(2x=6\)
\(x=3\)
Tìm ƯCLN ( 180; 168 )
Ta có:
180 = 22 x 32 x 5
168 = 23 x 3 x 7
=> ƯCLN ( 180; 168 ) = 22 x 3 = 4 x 3 = 12
Tìm BCNN ( 180; 168 )
Ta có:
180 = 22 x 32 x 5
168 = 23 x 3 x 7
=> BCNN ( 180; 168 ) = 23 x 32 x 5 x 7 = 8 x 9 x 5 x 7 = 2520
\(\frac{1}{10}\) + \(\frac{1}{40}\) +\(\frac{1}{88}\)+\(\frac{1}{154}\) + \(\frac{1}{238}\) + \(\frac{1}{340}\)
= \(\frac{1}{8}\) + \(\frac{1}{56}\) + \(\frac{1}{140}\)
= \(\frac{1}{7}\) + \(\frac{1}{140}\)
= \(\frac{3}{20}\)
B=134217728