题目内容

简便计算.
(1)46.7-15.03-4.97
(2)1.25×2.5×0.8×40
(3)13÷2.5
(4)(
1
9
+
1
27
)×4+
23
27
(1)46.7-15.03-4.97,
=46.7-(15.03+4.97),
=46.7-20,
=26.7;

(2)1.25×2.5×0.8×40,
=1.25×0.8×2.5×40,
=(1.25×0.8)×(2.5×40),
=1×100,
=100;

(3)13÷2.5,
=(13×4)÷(2.5×4),
=52÷10,,
=5.2,

(4)(
1
9
+
1
27
)×4+
23
27

=
1
9
×4+
1
27
×4+
23
27

=
4
9
+
4
27
+
23
27

=
4
9
+(
4
27
+
23
27
),
=
4
9
+1,
=1
4
9
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