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)
×〔7-4÷(
+
)〕
(4)
×
-
×
.
(1)〔6.9÷(3.26-0.96)+4.5〕×11
(2)1.8×73.5+27.5×1.8-1.8
(3)
| 2 |
| 5 |
| 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)
×[7-4÷(
+
)],
=
×[7-4÷
],
=
×[7-4×
],
=
×[7-5],
=
×2,
=
;
(4)
×
-
×
,
=
×(
+
)-
×
,
=
×
+
×
-
×
,
=
×
+
-
×
,
=
×
+
-
×
,
=
.
=[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 |
| 2 |
| 15 |
| 2 |
| 3 |
=
| 2 |
| 5 |
| 4 |
| 5 |
=
| 2 |
| 5 |
| 5 |
| 4 |
=
| 2 |
| 5 |
=
| 2 |
| 5 |
=
| 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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