题目内容
用简便方法计算:
(1)1.456×89+102×1.456-91×1.456
(2)20102-20092
(1)1.456×89+102×1.456-91×1.456
(2)20102-20092
(1)1.456×89+102×1.456-91×1.456,
=1.456×(89+102-91),
=1.456×100,
=145.6;
(2)20102-20092,
=(2010+2009),
=4019.
=1.456×(89+102-91),
=1.456×100,
=145.6;
(2)20102-20092,
=(2010+2009),
=4019.
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