А) (-2,25+4 2/3)+(7,6-1 8/9-1 3/4)-7,6
=-2,25+4 2/3+7,6-1 8/9-1 3/4-7,6=
-1 2/9
7,6-7,6=0
-2,25-1 3/4=-2,25-1,75=-4
4 2/3-1 8/9=4 6/9-1 8/9=2 7/9
-4+2 7/9=-1 2/9
Б) (-4/15+1,18-5/7)+1 3/14+(-1,68+2 4/15)
=-4/15+1,18-5/7+1 3/14-1,68+2 4/15=2
1,18-1,68=-0,5
2 4/15-4/15=2
1 3/14-5/7=1 3/14-10/14=7/14=1/2=0,5
0,5-0,5=0
0+2=2
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Answers & Comments
А) (-2,25+4 2/3)+(7,6-1 8/9-1 3/4)-7,6
=-2,25+4 2/3+7,6-1 8/9-1 3/4-7,6=
-1 2/9
7,6-7,6=0
-2,25-1 3/4=-2,25-1,75=-4
4 2/3-1 8/9=4 6/9-1 8/9=2 7/9
-4+2 7/9=-1 2/9
Б) (-4/15+1,18-5/7)+1 3/14+(-1,68+2 4/15)
=-4/15+1,18-5/7+1 3/14-1,68+2 4/15=2
1,18-1,68=-0,5
2 4/15-4/15=2
1 3/14-5/7=1 3/14-10/14=7/14=1/2=0,5
0,5-0,5=0
0+2=2