题目内容
计算下面各题,能简算的要简算.
4
-
+
2.01×1001-2.01
(
+
)÷
×[1÷(
-
)]
2+1÷(1-
)
4
| 3 |
| 5 |
| 7 |
| 8 |
| 2 |
| 5 |
2.01×1001-2.01
(
| 7 |
| 8 |
| 13 |
| 16 |
| 13 |
| 16 |
| 1 |
| 6 |
| 3 |
| 5 |
| 3 |
| 10 |
2+1÷(1-
| 3 |
| 4 |
分析:(1)4
-
+
,运用加、减法的运算性质进行简算;
(2)2.01×1001-2.01,运用乘法分配律进行简算;
(3)(
+
)÷
,把除数转化为乘它的倒数,运用乘法分配律进行简算;
(4)
×[1÷(
-
)],按照分数四则混合运算的运算顺序进行计算;
(5)2+1÷(1-
),根据分数四则混合运算的运算顺序进行计算.
| 3 |
| 5 |
| 7 |
| 8 |
| 2 |
| 5 |
(2)2.01×1001-2.01,运用乘法分配律进行简算;
(3)(
| 7 |
| 8 |
| 13 |
| 16 |
| 13 |
| 16 |
(4)
| 1 |
| 6 |
| 3 |
| 5 |
| 3 |
| 10 |
(5)2+1÷(1-
| 3 |
| 4 |
解答:解:(1)4
-
+
,
=4
+
-
,
=5-
,
=4
;
(2)2.01×1001-2.01,
=2.01×(1001-1),
=2.01×1000,
=2010;
(3)(
+
)÷
,
=(
+
)×
,
=
×
+
×
,
=
+1,
=2
;
(4)
×[1÷(
-
)],
=
×[1÷
],
=
×[1×
],
=
×
,
=
;
(5)2+1÷(1-
),
=2+1÷
,
=2+1×4,
=2+4,
=6.
| 3 |
| 5 |
| 7 |
| 8 |
| 2 |
| 5 |
=4
| 3 |
| 5 |
| 2 |
| 5 |
| 7 |
| 8 |
=5-
| 7 |
| 8 |
=4
| 1 |
| 8 |
(2)2.01×1001-2.01,
=2.01×(1001-1),
=2.01×1000,
=2010;
(3)(
| 7 |
| 8 |
| 13 |
| 16 |
| 13 |
| 16 |
=(
| 7 |
| 8 |
| 13 |
| 16 |
| 16 |
| 13 |
=
| 7 |
| 8 |
| 16 |
| 13 |
| 13 |
| 16 |
| 16 |
| 13 |
=
| 14 |
| 13 |
=2
| 1 |
| 13 |
(4)
| 1 |
| 6 |
| 3 |
| 5 |
| 3 |
| 10 |
=
| 1 |
| 6 |
| 3 |
| 10 |
=
| 1 |
| 6 |
| 10 |
| 3 |
=
| 1 |
| 6 |
| 10 |
| 3 |
=
| 5 |
| 9 |
(5)2+1÷(1-
| 3 |
| 4 |
=2+1÷
| 1 |
| 4 |
=2+1×4,
=2+4,
=6.
点评:此题主要考查分数、小数四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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