Ответы
Ответ:
В решении.
Пошаговое объяснение:
1.
а) -5/13 + (-7/13) =
= -(5/13 + 7/13) =
= -12/13;
б) 3/11 + (-8/11) =
= 3/11 - 8/11 =
= -(8/11 - 3/11) =
= -5/11;
в) -9/17 + 13/17 =
= +(13/17 - 9/17) =
= 4/17.
2.
а) -2/5 + (-2/15) =
= -(2/5 + 2/15) =
общий знаменатель 15:
= -(3*2 + 2)/15 =
= - 8/15;
б) -2/5 + 3/4 =
= -0,4 + 0,75 =
= +(0,75 - 0,4) =
= 0,35;
в) -11/27 + 5/18=
общий знаменатель 54:
= (-11*2 + 3*5)/54 =
=(-22 + 15)/54 =
= -7/54.
1.
а) -4/11 - 6/11 =
= -(4/11 + 6/11) =
= -10/11;
б) 5/13 - 8/13 =
= -(8/13 - 5/13) =
= -3/13;
в) -8/17 - (-12/17) =
= -8/17 + 12/17 =
= +(12/17 - 8/17) =
= 4/17.
2.
а) -1/4 - 3/16 =
= -(1/4 + 3/16) =
общий знаменатель 16:
= -(4*1 + 3)/16 =
= -7/16;
б) -1/4 - (-2/5) =
= -1/4 + 2/5 =
= -0,25 + 0,4 =
= 0,4 - 0,25 = 0,15;
в) -5/36 - (-5/27) =
= -5/36 + 5/27 =
общий знаменатель 108:
=(-5*3 + 4*5)/108 =
= (-15 + 20)/108 =
= 5/108.