题目内容
计算下列各题.
14-6.46-3.54(简算)
×
+
×
(简算)
(
-
)÷
×
[1-(
+
)]×36.
14-6.46-3.54(简算)
8 |
17 |
1 |
19 |
1 |
19 |
9 |
17 |
(
3 |
4 |
1 |
3 |
2 |
3 |
1 |
6 |
[1-(
1 |
2 |
1 |
3 |
分析:(1)运用减法的性质简算;
(2)运用乘法分配律简算;
(3)先算括号内的,再算括号外的除法和乘法;
(4)先算小括号内的,再算中括号内的,最后算括号外的.
(2)运用乘法分配律简算;
(3)先算括号内的,再算括号外的除法和乘法;
(4)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)14-6.46-3.54,
=14-(6.46+3.54),
=14-10,
=4;
(2)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)(
-
)÷
×
,
=
×
×
,
=
;
(4)[1-(
+
)]×36,
=[1-
]×36,
=
×36,
=6.
=14-(6.46+3.54),
=14-10,
=4;
(2)
8 |
17 |
1 |
19 |
1 |
19 |
9 |
17 |
=(
8 |
17 |
9 |
17 |
1 |
19 |
=1×
1 |
19 |
=
1 |
19 |
(3)(
3 |
4 |
1 |
3 |
2 |
3 |
1 |
6 |
=
5 |
12 |
3 |
2 |
1 |
6 |
=
1 |
48 |
(4)[1-(
1 |
2 |
1 |
3 |
=[1-
5 |
6 |
=
1 |
6 |
=6.
点评:此题是考查四则混合运算,注意运算顺序,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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