1) 21-(5-8) 2) 3.7-(4- 5.3) 3) 1/6-(5/12-7/12) - вопрос №45538791215823745331651271241320325457 от Markkamm 26.12.2020 00:29

Question

Математика: 1) 21-(5-8) 2) 3.7-(4- 5.3) 3) 1/6-(5/12-7/12) 4) -13-(20-32) 5) -4.5-(7- 9.5) 6) -5/8-(5/8-1) 7) -18-(9-5) 8) -0.25-(3- 2.25) 9) -2/9-(1- 8.9)

Markkamm · Answer

1) 21-(5-8)=21-(-3)=21+3=242) 3.7-(4- 5.3)=3,7-(-1,3)=3,7+1,3=53) 1/6-(5/12-7/12)= 1/6 -(-2/12)=1/6+1/6=2/6=1/34) -13-(20-32)=-13-(-12)=12-13=-15) -4.5-(7- 9.5)=-4,5-(-2,5)=2,5-4,5=-26) -5/8-(5/8-1)= -5/8 - (-3/8) = 3/8-5/8 = -2/8=-1/47) -18-(9-5)= -18-4=-228) -0.25-(3- 2.25)= -0,25-0,75=-19) -2/9-(1- 8.9)= -2/9-7,9= -20/90 - 711/90= -731/90 = -8 целых 11/90...