题目内容
计算:(能简便的就用简便方法计算)
(1)(
-
)×(
+
)
(2)95.6×18-95
×8
(3)(
-0.005×700)÷
(4)[2-(
-0.5)÷
]×
.
(1)(
7 |
8 |
5 |
16 |
5 |
9 |
2 |
3 |
(2)95.6×18-95
3 |
5 |
(3)(
9 |
2 |
1 |
2 |
(4)[2-(
2 |
3 |
5 |
12 |
3 |
8 |
分析:算式(1)(4)(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
算式(2)可将式中的分数化为小数后,再根据乘法分配律进行计算.
算式(2)可将式中的分数化为小数后,再根据乘法分配律进行计算.
解答:解:(1)(
-
)×(
+
)
=(
-
)×(
+
),
=
×
,
=
;
(2)95.6×18-95
×8
=95.6×18-95.6×8,
=(18-8)×95.6,
=10×95.6,
=956;
(3)(
-0.005×700)÷
=(4.5-3.5)×2,
=1×2,
=2;
(4)[2-(
-0.5)÷
]×
=[2-(
-
)×
]×
,
=[2-(
-
)×
]×
,
=[2-
×
]×
,
=[2-
]×
,
=
×
,
=
.
7 |
8 |
5 |
16 |
5 |
9 |
2 |
3 |
=(
14 |
16 |
5 |
16 |
5 |
9 |
6 |
9 |
=
9 |
16 |
11 |
9 |
=
11 |
16 |
(2)95.6×18-95
3 |
5 |
=95.6×18-95.6×8,
=(18-8)×95.6,
=10×95.6,
=956;
(3)(
9 |
2 |
1 |
2 |
=(4.5-3.5)×2,
=1×2,
=2;
(4)[2-(
2 |
3 |
5 |
12 |
3 |
8 |
=[2-(
2 |
3 |
1 |
2 |
12 |
5 |
3 |
8 |
=[2-(
4 |
6 |
3 |
6 |
12 |
5 |
3 |
8 |
=[2-
1 |
6 |
12 |
5 |
3 |
8 |
=[2-
2 |
5 |
3 |
8 |
=
8 |
5 |
3 |
8 |
=
3 |
5 |
点评:当四则混合运算的算式中同时含有分数与小数,要根据式中数据的特点灵活将它们互化,然后再进行计算.
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