题目内容
脱式计算,能简算的要简算
907×99+907
(
+
)÷
+
+
+
+
+(
-
)÷
.
907×99+907
(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
| 5 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
| 15 |
| 16 |
| 7 |
| 18 |
| 1 |
| 4 |
| 1 |
| 2 |
分析:(1)907×99+907,应用乘法分配律进行简算;
(2)(
+
)÷
+
,根据分数四则混合运算的运算顺序,按照分数四则计算的法则进行计算;
(3)
+
+
+
,应用加法交换律和结合律进行简算;
(4)
+(
-
)÷
,根据分数四则混合运算的运算顺序,按照分数四则计算的法则进行计算;
(2)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
(3)
| 5 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
(4)
| 15 |
| 16 |
| 7 |
| 18 |
| 1 |
| 4 |
| 1 |
| 2 |
解答:解:(1)907×99+907,
=907×(99+1),
=907×100,
=90700;
(2)(
+
)÷
+
,
=
×
+
,
=
+
,
=
,
=
;
(3)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(4)
+(
-
)÷
,
=
+
×2,
=
+
,
=
+
,
=1
.
=907×(99+1),
=907×100,
=90700;
(2)(
| 4 |
| 5 |
| 1 |
| 4 |
| 7 |
| 3 |
| 7 |
| 10 |
=
| 21 |
| 20 |
| 3 |
| 7 |
| 3 |
| 10 |
=
| 9 |
| 20 |
| 3 |
| 10 |
=
| 15 |
| 20 |
=
| 3 |
| 4 |
(3)
| 5 |
| 7 |
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 6 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 5 |
| 6 |
| 1 |
| 6 |
=1+1,
=2;
(4)
| 15 |
| 16 |
| 7 |
| 18 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 15 |
| 16 |
| 5 |
| 36 |
=
| 15 |
| 16 |
| 5 |
| 18 |
=
| 135 |
| 144 |
| 40 |
| 144 |
=1
| 31 |
| 144 |
点评:此题主要考查整数、分数四则混合运算,要注意分析式中数据,运用合适的简便方法计算.
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