题目内容
计算下列各题(能简算的要简算)
①
÷(
+
)×
②175×
+
×175
③
÷23+
×
+
④6.68×5.13+6.68×4.87.
①
| 4 |
| 5 |
| 3 |
| 5 |
| 1 |
| 2 |
| 5 |
| 7 |
②175×
| 3 |
| 10 |
| 7 |
| 10 |
③
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
| 1 |
| 23 |
④6.68×5.13+6.68×4.87.
考点:分数的四则混合运算,运算定律与简便运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:①先算加法,再算除法,最后算乘法;
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根据乘法分配律进行简算.
解答:
解:①
÷(
+
)×
=
÷
×
=
×
=
;
②175×
+
×175
=175×(
+
)
=175×1
=175;
③
÷23+
×
+
=
×
+
×
+
=(
+
+1)×
=2×
=
;
④6.68×5.13+6.68×4.87
=6.68×(5.13+4.87)
=6.68×10
=66.8.
| 4 |
| 5 |
| 3 |
| 5 |
| 1 |
| 2 |
| 5 |
| 7 |
=
| 4 |
| 5 |
| 11 |
| 10 |
| 5 |
| 7 |
=
| 8 |
| 11 |
| 5 |
| 7 |
=
| 40 |
| 77 |
②175×
| 3 |
| 10 |
| 7 |
| 10 |
=175×(
| 3 |
| 10 |
| 7 |
| 10 |
=175×1
=175;
③
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
| 1 |
| 23 |
=
| 8 |
| 17 |
| 1 |
| 23 |
| 1 |
| 23 |
| 9 |
| 17 |
| 1 |
| 23 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=2×
| 1 |
| 23 |
=
| 2 |
| 23 |
④6.68×5.13+6.68×4.87
=6.68×(5.13+4.87)
=6.68×10
=66.8.
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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