题目内容

脱式计算.((2)(4)题用简便算法计算并写出简算过程)
(1)〔6.9÷(3.26-0.96)+4.5〕×11
(2)1.8×73.5+27.5×1.8-1.8
(3)
2
5
×〔7-4÷(
2
15
+
2
3
)〕
(4)
24
25
×
1015
2011
-
48
5
×
99
2011
(1)[6.9÷(3.26-0.96)+4.5]×11,
=[6.9÷2.3+4.5]×11,
=[3+4.5]×11,
=7.5×11,
=82.5;

(2)1.8×73.5+27.5×1.8-1.8,
=(73.5+27.5-1)×1.8,
=100×1.8,
=180;

(3)
2
5
×[7-4÷(
2
15
+
2
3
)]

=
2
5
×[7-4÷
4
5
]

=
2
5
×[7-4×
5
4
]

=
2
5
×[7-5]

=
2
5
×2

=
4
5


(4)
24
25
×
1015
2011
-
48
5
×
99
2011

=
24
25
×(
990
2011
+
25
2011
)-
48×5
5×5
×
99
2011

=
24
25
×
990
2011
+
24
25
×
25
2011
-
24×10
25
×
99
2011

=
24
25
×
990
2011
+
24
2011
-
24
25
×
10×99
2011

=
24
25
×
990
2011
+
24
2011
-
24
25
×
990
2011

=
24
2011
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