题目内容
灵活计算.
952-952÷17 | (
|
(
| ||||||||||||||
1.28×5.37-2.8×0.537 |
|
|
分析:(1)先算除法,再算减法;
(2)先算小括号里的乘法,再算小括号里的减法,最后算括号外的除法;
(3)先运用乘法的分配律进行简算,再运用加法的结合律进行简算即可;
(4)运用乘法的分配律进行简算;
(5)先把除以
化成乘以
,再运用乘法的分配律进行简算;
(6)去括号,直接约分计算即可.
(2)先算小括号里的乘法,再算小括号里的减法,最后算括号外的除法;
(3)先运用乘法的分配律进行简算,再运用加法的结合律进行简算即可;
(4)运用乘法的分配律进行简算;
(5)先把除以
7 |
2 |
2 |
7 |
(6)去括号,直接约分计算即可.
解答:解:(1)952-952÷17,
=952-56,
=896;
(2)(
-
×
)÷
,
=(
-
)÷
,
=
÷
,
=
;
(3)(
+
)×12+
,
=
×12+
×12+
,
=5+
+
,
=5+(
+
),
=5+1,
=6;
(4)1.28×5.37-2.8×0.537,
=1.28×5.37-0.28×5.37,
=(1.28-0.28)×5.37,
=1×5.37,
=5.37;
(5)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(6)
×
×(2009×42×85),
=
×
×2009×42×85,
=2009×2×5,
=2009×(2×5),
=2009×10,
=20090.
=952-56,
=896;
(2)(
3 |
4 |
3 |
4 |
2 |
5 |
1 |
5 |
=(
3 |
4 |
3 |
10 |
1 |
5 |
=
9 |
20 |
1 |
5 |
=
9 |
4 |
(3)(
5 |
12 |
1 |
19 |
7 |
19 |
=
5 |
12 |
1 |
19 |
7 |
19 |
=5+
12 |
19 |
7 |
12 |
=5+(
12 |
19 |
7 |
12 |
=5+1,
=6;
(4)1.28×5.37-2.8×0.537,
=1.28×5.37-0.28×5.37,
=(1.28-0.28)×5.37,
=1×5.37,
=5.37;
(5)
2 |
7 |
11 |
15 |
4 |
15 |
7 |
2 |
=
2 |
7 |
11 |
15 |
4 |
15 |
2 |
7 |
=
2 |
7 |
11 |
15 |
4 |
15 |
=
2 |
7 |
=
2 |
7 |
(6)
1 |
21 |
1 |
17 |
=
1 |
21 |
1 |
17 |
=2009×2×5,
=2009×(2×5),
=2009×10,
=20090.
点评:此题考查了整数、分数四则混合运算的顺序,注意灵活运用运算定律进行简算.
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