1988+1989×19871988×1989−1=_.
1988+1989×1987 |
1988×1989−1 |
=______.
数学人气:125 ℃时间:2019-12-19 00:14:34
优质解答
1988+1989×1987 |
1988×1989−1 |
,
=
1988+1989×(1988−1) |
1988×1989−1 |
,
=
1988+1989×1988−1989 |
1988×1989−1 |
,
=
,
=1;
故答案为:1.
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