题目内容

简便计算
4×0.27×253.8×99+3.8(8+
4
9
)÷4
9
7
-
4
5
-
1
5
(1)4×0.27×25,
=(4×25)×0.27,
=100×0.27,
=27;

(2)3.8×99+3.8,
=3.8×(99+1),
=3.8×100,
=380;

(3)(8+
4
9
)÷4,
=(8+
4
9
)×
1
4

=8×
1
4
+
4
9
×
1
4

=2+
1
9

=2
1
9


(4)
9
7
-
4
5
-
1
5

=
9
7
-(
4
5
+
1
5
),
=
9
7
-1,
=
2
7
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