\(1)\dfrac{179}{50}-\left(\dfrac{59}{30}+\dfrac{3}{5}\right)\)
\(=\dfrac{179}{50}-\left(\dfrac{118}{60}+\dfrac{36}{60}\right)\)
\(=\dfrac{179}{50}-\dfrac{77}{30}\)
\(=\dfrac{537}{150}-\dfrac{385}{150}\)
\(=\dfrac{152}{150}=\dfrac{76}{75}=1\dfrac{1}{75}\)
Câu 1 : Ta có : 179/50 - ( 59/30 + 3/5 ) .
= 179/50 - ( 59/30 + 18/30 ) .
= 179/50 - 77/30 .
= 537/150 - 385/150.
= 76/75 .
Câu 2 : Ta có : ( 3,5 - 70,84 : 23 + 4 ) - 3,375 . 4/9 : 0,78 .
= ( 3,5 - 3,08 + 4 ) - 27/8 . 4/9 : 39/2 .
= 4,42 - 3/2 . 2/39 .
= 221/50 - 1/13 .
= 2873/650 - 50/650 .
= 2823/50 .
= 56,46 .
Câu 1:
\(\dfrac{179}{50}-\left(\dfrac{59}{30}+\dfrac{18}{30}\right)=\dfrac{179}{50}-\dfrac{77}{30}=\dfrac{537}{150}-\dfrac{385}{150}=\dfrac{152}{150}=\dfrac{76}{75}\)
Câu 2:
\(\left(3,5-70,84:23+4\right)-3,375.\dfrac{4}{9}:0,78=\left(3,5-3,08+4\right)-3,375.\dfrac{4}{9}:0,78=\left(0,42+4\right)-3,375.\dfrac{4}{9}:0,78=4,42-3,375.\dfrac{4}{9}:0,78=4,42-1,5:0,78=4,42-1,9230=2,497\)
