问题 解答题
下面各题怎样简便就怎样算.
827-98-102

378+169+22

475-197
15×(512-478)819÷(270-261)540÷45×230.
答案

(1)827-98-102,

=827-(98+102),

=827-200,

=627;

(2)378+169+22,

=378+22+169,

=400+169,

=569;

(3)475-197,

=(475+3)-(197+3),

=478-200,

=278;

(4)15×(512-478),

=15×34,

=510;

(5)819÷(270-261),

=819÷9,

=91;

(6)540÷45×230,

=12×230,

=2760.

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