A-A+
在横线里填上合适的数或符号.(1)25-19-89+35=25+35-(19______89
问题详情
在横线里填上合适的数或符号.
(1)2 5- 1 9- 8 9+ 3 5= 2 5+ 3 5-( 1 9______ 8 9)
(2)11 18-( 7 18+ 1 9)= 11 18-______-______
(3)5 19+ 6 11+ 5 11+ 10 19=( 5 19+______)+(______+______)
(4)2 7+ 5 11+ 5 7=______+______+ 5 11.
参考答案
(1)25-19-89+35,
=25+35-(19+89),
=1-1,
=0;
(2)1118-(718+19).
=1118-718-19,
=29-19,
=19;
(3)519+611+511+1019,
=(519+1019)+(611+511),
=1519+1,
=11519;
(4)27+511+57,
=27+57+511,
=1+511,
=1511.
故答案为:+,718,19,1019,611,511,27,57.考点:横线,符号