a) −11⁄2 + (−21⁄2) = −11⁄2 − 21⁄2 = −(11⁄2 + 21⁄2) = −((1 + 2) + (1⁄2 + 1⁄2)) = −(3 + 2⁄2) = −(3 + 1) = -4
Ответ: -4
б) −49⁄14 + (−11⁄7) = −49⁄14 − 11⁄7 = −(49⁄14 + 11⁄7) = −((4 + 1) + (9⁄14 + 1⁄7)) = −(5 + (9⁄14 + 1 * 2⁄7 * 2)) = −(5 + (9⁄14 + 2⁄14)) = −(5 + 11⁄14) = -511⁄14
Ответ: -511⁄14
в) −57⁄12 + (−23⁄4) = −57⁄12 − 23⁄4 = −(57⁄12 + 23⁄4) = −((5 + 2) + (7⁄12 + 3⁄4)) = −(7 + (7⁄12 + 3 * 3⁄4 * 3)) = −(7 + (7⁄12 + 9⁄12)) = −(7 + 16⁄12) = −(7 + 14⁄12) = −(7 + 1 + 4⁄12) = −(8 + 4⁄12) = -84⁄12 = -81⁄3
Ответ: -81⁄3
г) −34⁄9 + (−85⁄6) = −34⁄9 − 85⁄6 = −(34⁄9 + 85⁄6) = −((3 + 8) + (4⁄9 + 5⁄6)) = −(11 + (4 * 2⁄9 * 2 + 5 * 3⁄6 * 3)) = −(11 + (8⁄18 + 15⁄18)) = −(11 + 23⁄18) = −(11 + 15⁄18) = −(11 + 1 + 5⁄18) = −(12 + 5⁄18) = -125⁄18
Ответ: -125⁄18
д) −512⁄17 + (−15⁄24) + (−13⁄8) + (−5⁄17) = −512⁄17 − 15⁄24 − 13⁄8 − 5⁄17 = −((5 + 1) + (12⁄17 + 5⁄17) + 15⁄24 + 3⁄8) = −(6 + 17⁄17 + 15⁄24 + 3 * 3⁄8 * 3) = −(6 + 1 + 15⁄24 + 9⁄24) = −(7 + 24⁄24) = −(7 + 1) = -8
Ответ: -8
e) −9⁄28 + (−49⁄35) + (−25⁄28) + (−12⁄35) = −9⁄28 − 49⁄35 − 25⁄28 − 12⁄35 = −((4 + 2) + (9⁄28 + 5⁄28) + (9⁄35 + 12⁄35)) = −(6 + 14⁄28 + 21⁄35) = −(6 + 1⁄2 + 3⁄5) = −(6 + 1 * 5⁄2 * 5 + 3 * 2⁄5 * 2) = −(6 + 5⁄10 + 6⁄10) = −(6 + 11⁄10) = −(6 + 11⁄10) = −(6 + 1 + 1⁄10) = −(7 + 1⁄10) = -71⁄10
Ответ: -71⁄10