题目内容
下面各题,怎样算简便就怎样算.
÷
+
×
;
÷(
-
-
);
÷[
×(
+
)].
| 2 |
| 7 |
| 4 |
| 5 |
| 5 |
| 7 |
| 5 |
| 4 |
| 3 |
| 8 |
| 5 |
| 4 |
| 8 |
| 17 |
| 9 |
| 17 |
| 7 |
| 8 |
| 7 |
| 12 |
| 6 |
| 7 |
| 9 |
| 14 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)先把除法转化为乘法,然后运用乘法分配律进行简算;
(2)先运用减法的性质计算括号里的,然后计算括号外的除法即可;
(3)先算小括号里的,再算中括号的,最后算括号外的除法.
(2)先运用减法的性质计算括号里的,然后计算括号外的除法即可;
(3)先算小括号里的,再算中括号的,最后算括号外的除法.
解答:
解:(1)
÷
+
×
=
×
+
×
=(
+
)×
=
(2)
÷(
-
-
)
=
÷[
-(
+
)]
=
÷[
-1]
=
×4
=
(3)
÷[
×(
+
)]
=
÷[
×
]
=
÷
=1
| 2 |
| 7 |
| 4 |
| 5 |
| 5 |
| 7 |
| 5 |
| 4 |
=
| 2 |
| 7 |
| 5 |
| 4 |
| 5 |
| 7 |
| 5 |
| 4 |
=(
| 2 |
| 7 |
| 5 |
| 7 |
| 5 |
| 4 |
=
| 5 |
| 4 |
(2)
| 3 |
| 8 |
| 5 |
| 4 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 3 |
| 8 |
| 5 |
| 4 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 3 |
| 8 |
| 5 |
| 4 |
=
| 3 |
| 8 |
=
| 3 |
| 2 |
(3)
| 7 |
| 8 |
| 7 |
| 12 |
| 6 |
| 7 |
| 9 |
| 14 |
=
| 7 |
| 8 |
| 7 |
| 12 |
| 3 |
| 2 |
=
| 7 |
| 8 |
| 7 |
| 8 |
=1
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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