题目内容

脱式计算(能简算的要简算).
①2.5×1.25×32
5
11
×
2
7
+
6
7
×
2
11
2006
2007
×2008
①2.5×1.25×32,
=2.5×1.25×4×8,
=(2.5×4)×(1.25×8),
=10×10,
=100;

5
11
×
2
7
+
6
7
×
2
11

=
5
11
×
2
7
+
2
7
×
6
11

=(
5
11
+
6
11
)×
2
7

=1×
2
7

=
2
7


2006
2007
×2008

=
2006
2007
×(2007+1),
=
2006
2007
×2007+
2006
2007
×1,
=2006+
2006
2007

=2006
2006
2007
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