题目内容
下面各题,怎样简便就怎样算.
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64÷
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(
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分析:(1)根据乘法交换律进行简算;
(2)根据乘法分配律进行简算;
(3)按照从左向右的顺序进行计算;
(4)先算除法,再算减法;
(5)小括号里面的根据减法的性质进行简算,最后算除法;
(6)先算减法,再算乘法.
(2)根据乘法分配律进行简算;
(3)按照从左向右的顺序进行计算;
(4)先算除法,再算减法;
(5)小括号里面的根据减法的性质进行简算,最后算除法;
(6)先算减法,再算乘法.
解答:解:
(1)
÷
÷
,
=
÷
÷
,
=1÷
,
=
;
(2)
×
+
×
,
=
×(
+
),
=
;
(3)
×
×56,
=
×56,
=35;
(4)64÷
-0.6,
=24-0.6,
=23.4;
(5)
÷(3-
-
),
=
÷[3-(
+
)],
=
÷[3-1],
=
÷2,
=
;
(6)(
-
)×
,
=
×
,
=
.
(1)
| 5 |
| 6 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 5 |
| 6 |
| 2 |
| 3 |
=1÷
| 2 |
| 3 |
=
| 3 |
| 2 |
(2)
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
=
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 3 |
| 4 |
(3)
| 7 |
| 8 |
| 5 |
| 7 |
=
| 5 |
| 8 |
=35;
(4)64÷
| 8 |
| 3 |
=24-0.6,
=23.4;
(5)
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
| 5 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 4 |
=
| 1 |
| 4 |
=
| 1 |
| 8 |
(6)(
| 5 |
| 6 |
| 2 |
| 3 |
| 9 |
| 10 |
=
| 1 |
| 6 |
| 9 |
| 10 |
=
| 3 |
| 20 |
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律简便计算.
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