718. 1 )( 27 28 - 5 9 )-(- 1 28 +8 4 9 ); 2) -(- 20 27 + 3 8 )+(-5 5 8 +4 7 27 3) (10,8-49 2 7 )-(-9,2+3 5 7 ); 4) - (81, 3 - 3 11/16) - (9, 9 - 11 5/16)
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2). -(-20/27+3/8)+(-5.5/8+4.7/27)=20/27-3/8-5.5/8+4.7/27=20/27-3/8-45/8+115/27=20/27+115/27-3/8-45/8=115/27-48/8=5-6=-1
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