题目内容
9
|
| ||||||||||||||
| (5.52÷0.6-8.6)×1.5; |
| ||||||||||||||
(6
|
|
分析:(1)根据减法的性质进行简算;
(2)根据乘法分配律进行简算;
(3)先算除法,再算减法,最后算乘法;
(4)先算小括号里面的减法,再算乘法,最后算括号外面的减法;
(5)先算减法,再算乘法;
(6)先算加法,再算乘法,最后算除法.
(2)根据乘法分配律进行简算;
(3)先算除法,再算减法,最后算乘法;
(4)先算小括号里面的减法,再算乘法,最后算括号外面的减法;
(5)先算减法,再算乘法;
(6)先算加法,再算乘法,最后算除法.
解答:解:(1)9
-1
-4
=9
-(1
+4
)
=9
-6
=3
;
(2)
×
+
×
=
×(
+
)
=
×1
=
;
(3)(5.52÷0.6-8.6)×1.5
=(9.2-8.6)×1.5
=0.6×1.5
=0.9;
(4)
-
×(
-
)
=
-
×
=
-
=
;
(5)(6
-5
)×(7-4
)
=
×
=
;
(6)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=
.
| 4 |
| 11 |
| 1 |
| 3 |
| 2 |
| 3 |
=9
| 4 |
| 11 |
| 1 |
| 3 |
| 2 |
| 3 |
=9
| 4 |
| 11 |
=3
| 4 |
| 11 |
(2)
| 2 |
| 3 |
| 4 |
| 15 |
| 2 |
| 3 |
| 11 |
| 15 |
=
| 2 |
| 3 |
| 4 |
| 15 |
| 11 |
| 15 |
=
| 2 |
| 3 |
=
| 2 |
| 3 |
(3)(5.52÷0.6-8.6)×1.5
=(9.2-8.6)×1.5
=0.6×1.5
=0.9;
(4)
| 3 |
| 4 |
| 2 |
| 3 |
| 5 |
| 8 |
| 1 |
| 2 |
=
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 8 |
=
| 3 |
| 4 |
| 1 |
| 12 |
=
| 2 |
| 3 |
(5)(6
| 1 |
| 2 |
| 3 |
| 10 |
| 1 |
| 3 |
=
| 6 |
| 5 |
| 8 |
| 3 |
=
| 16 |
| 5 |
(6)
| 1 |
| 5 |
| 1 |
| 6 |
| 5 |
| 18 |
| 3 |
| 5 |
=
| 1 |
| 5 |
| 4 |
| 9 |
| 3 |
| 5 |
=
| 1 |
| 5 |
| 4 |
| 15 |
=
| 3 |
| 4 |
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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