题目内容
| 计算(能简算的要写出主要简算过程) 980×120%-980×
|
3.14×112-92×3.14 | ||||||||||
(
|
9.14+
|
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据加法交换律和结合律进行简算.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据加法交换律和结合律进行简算.
解答:解:(1)980×120%-980×
=980×(120%-
)
=980×1
=980;
(2)3.14×112-92×3.14
=3.14×(112-92)
=3.14×(121-81)
=3.14×40
=125.6;
(3)(
+
)÷
=(
+
)×
=
×
+
×
=
+1
=2
;
(4)9.14+
+86%+
=(9.14+86%)+(
+
)
=10+1
=11.
| 1 |
| 5 |
=980×(120%-
| 1 |
| 5 |
=980×1
=980;
(2)3.14×112-92×3.14
=3.14×(112-92)
=3.14×(121-81)
=3.14×40
=125.6;
(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)9.14+
| 12 |
| 17 |
| 5 |
| 17 |
=(9.14+86%)+(
| 12 |
| 17 |
| 5 |
| 17 |
=10+1
=11.
点评:考查了运算定律与简便运算,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简便计算.
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