题目内容
(2011?金堂县)用自己喜欢的方式计算下面各题(要写出主要的解答过程)
(1)3600-800÷40×35
(2)64-15.8-14.2
(3)(56×
-27)×
(4)(
-
+
)×36
(5)18×
-5×
+
(6)38÷[2.5×(4.36+3.64)].
(1)3600-800÷40×35
(2)64-15.8-14.2
(3)(56×
5 |
7 |
9 |
13 |
(4)(
5 |
12 |
1 |
6 |
7 |
18 |
(5)18×
9 |
14 |
9 |
14 |
9 |
14 |
(6)38÷[2.5×(4.36+3.64)].
分析:(1)先算除法,再算乘法,最后算减法;
(2)根据连续减去两个数,等于减去这两个数的和简算;
(3)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的乘法;
(4)(5)运用乘法分配律简算;
(6)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法.
(2)根据连续减去两个数,等于减去这两个数的和简算;
(3)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的乘法;
(4)(5)运用乘法分配律简算;
(6)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法.
解答:解:(1)3600-800÷40×35,
=3600-20×35,
=3600-700,
=2900;
(2)64-15.8-14.2,
=64-(15.8+14.2),
=64-30,
=34;
(3)(56×
-27)×
,
=(40-27)×
,
=13×
,
=9;
(4)(
-
+
)×36,
=
×36-
×36+
×36,
=15-6+14,
=9+14,
=23;
(5)18×
-5×
+
,
=(18-5+1)×
,
=14×
,
=9;
(6)38÷[2.5×(4.36+3.64)],
=38÷[2.5×8],
=38÷20,
=1.9.
=3600-20×35,
=3600-700,
=2900;
(2)64-15.8-14.2,
=64-(15.8+14.2),
=64-30,
=34;
(3)(56×
5 |
7 |
9 |
13 |
=(40-27)×
9 |
13 |
=13×
9 |
13 |
=9;
(4)(
5 |
12 |
1 |
6 |
7 |
18 |
=
5 |
12 |
1 |
6 |
7 |
18 |
=15-6+14,
=9+14,
=23;
(5)18×
9 |
14 |
9 |
14 |
9 |
14 |
=(18-5+1)×
9 |
14 |
=14×
9 |
14 |
=9;
(6)38÷[2.5×(4.36+3.64)],
=38÷[2.5×8],
=38÷20,
=1.9.
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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