20(7/10-3 1/4) -21(2/21+8/21) (2 5/21-22): 2/105 - вопрос №369943920710314212218212521222105 от sobennikovaox 25.12.2020 01:01

Question

Математика: 20(7/10-3 1/4) -21(2/21+8/21) (2 5/21-22): 2/105

sobennikovaox · Answer

1)20(7/10-3ц1/4)=20(7/10-13/4)=20(14/20-65/20)=20(-51/20)=20/1*(-51/20)=-51; 2)-21(2/21+8/21)=-21(10/21)=-21/1*10/21=-10; 3)(2ц5/21-22):2/105=(47/21-22/1):2/105=47/21-22*21/21):2/105=(47-462)/21):2/105=(-415/21)*105/2=-415*5/2=-830/2=-415....