题目内容

(1)2012×
2010
2011

(2)
1
8
×78+0.5×1.25-730÷80
(3)56÷11×165÷7
(4)(
1
4
-
1
7
)×28+4
4
7
×7-3
4
7
×7.
(1)2012×
2010
2011

=(2011+1)×
2010
2011

=2010+
2010
2011

=2010
2010
2011


(2)
1
8
×78+0.5×1.25-730÷80
=1.25×78+0.5×1.25-73÷8,
=1.25×78+0.5×1.25-7.3×1.25,
=1.25×(7.8+0.5-7.3),
=1.25;

(3)56÷11×165÷7,
=(56÷7)×(165÷11),
=8×15,
=120;

(4)(
1
4
-
1
7
)×28+4
4
7
×7-3
4
7
×7,
=
1
4
×28-
1
7
×28+4
4
7
×7-3
4
7
×7,
=7-4+(4
4
7
-3
4
7
)×7,
=3+7,
=10.
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