题目内容
计算:
(1)2011-2.6×2.6+
×1.4
(2)
×2.96÷2
÷(1
×1.48)×4
(3)2
×(1
-
)-(
+1
)÷3
(4)[
+
×2+(1
-0.625)]×0.7.
(1)2011-2.6×2.6+
| 7 |
| 5 |
(2)
| 3 |
| 7 |
| 1 |
| 11 |
| 5 |
| 7 |
| 2 |
| 11 |
(3)2
| 2 |
| 3 |
| 7 |
| 8 |
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 6 |
| 1 |
| 4 |
(4)[
| 1 |
| 24 |
| 3 |
| 14 |
| 7 |
| 12 |
分析:本题根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)2011-2.6×2.6+
×1.4
=2011-6.76+3.36,
=2004.24+3.36,
=2007.6;
(2)
×2.96÷2
÷(1
×1.48)×4
=
×
×
÷(
×
)×
,
=
×
×
×
×
,
=
;
(3)2
×(1
-
)-(
+1
)÷3
=
×
-
×
,
=
-
,
=
;
(4)[
+
×2+(1
-0.625)]×0.7
=[
+
+(
-
)]×0.7,
=[
+
+
]×0.7,
=[1+
]×0.7,
=
×
,
=1.
| 7 |
| 5 |
=2011-6.76+3.36,
=2004.24+3.36,
=2007.6;
(2)
| 3 |
| 7 |
| 1 |
| 11 |
| 5 |
| 7 |
| 2 |
| 11 |
=
| 3 |
| 7 |
| 74 |
| 25 |
| 11 |
| 23 |
| 12 |
| 7 |
| 49 |
| 25 |
| 46 |
| 11 |
=
| 3 |
| 7 |
| 74 |
| 25 |
| 11 |
| 23 |
| 25 |
| 84 |
| 46 |
| 11 |
=
| 37 |
| 49 |
(3)2
| 2 |
| 3 |
| 7 |
| 8 |
| 5 |
| 6 |
| 7 |
| 8 |
| 5 |
| 6 |
| 1 |
| 4 |
=
| 8 |
| 3 |
| 25 |
| 24 |
| 65 |
| 24 |
| 4 |
| 13 |
=
| 25 |
| 9 |
| 5 |
| 6 |
=
| 5 |
| 3 |
(4)[
| 1 |
| 24 |
| 3 |
| 14 |
| 7 |
| 12 |
=[
| 1 |
| 24 |
| 3 |
| 7 |
| 19 |
| 12 |
| 5 |
| 8 |
=[
| 1 |
| 24 |
| 3 |
| 7 |
| 23 |
| 24 |
=[1+
| 3 |
| 7 |
=
| 10 |
| 7 |
| 7 |
| 10 |
=1.
点评:本题中的题目由于不能运用简便方法计算,因此完成时要细心,注意通分约分.
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