题目内容
计算下列各题,能简算的要简算.
(1-
|
30×(
|
|
|
分析:(1)先算小括号里面的减法,再把除法变成乘法,运用乘法结合律简算;
(2)运用乘法分配律简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)按照从左到右的顺序计算.
(2)运用乘法分配律简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(4)按照从左到右的顺序计算.
解答:解:(1)(1-
)×
÷
,
=
×
÷
,
=
×
×
=
×(
×
),
=
×
,
=
;
(2)30×(
+
+
),
=30×
+30×
+30×
,
=2+24+10,
=36;
(3)
×
+
÷4,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)
÷0.375×
,
=
×
×
,
=
×
,
=
.
14 |
15 |
4 |
9 |
5 |
18 |
=
1 |
15 |
4 |
9 |
5 |
18 |
=
1 |
15 |
4 |
9 |
18 |
5 |
=
1 |
15 |
4 |
9 |
18 |
5 |
=
1 |
15 |
8 |
5 |
=
8 |
75 |
(2)30×(
1 |
15 |
4 |
5 |
1 |
3 |
=30×
1 |
15 |
4 |
5 |
1 |
3 |
=2+24+10,
=36;
(3)
1 |
4 |
3 |
5 |
2 |
5 |
=
1 |
4 |
3 |
5 |
2 |
5 |
1 |
4 |
=
1 |
4 |
3 |
5 |
2 |
5 |
=
1 |
4 |
=
1 |
4 |
(4)
3 |
16 |
4 |
5 |
=
3 |
16 |
8 |
3 |
4 |
5 |
=
1 |
2 |
4 |
5 |
=
2 |
5 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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