题目内容
灵活计算下面各题.
(1)12×(87+368÷16)
(2)
÷
+
×
(3)10.6-(6.6+
÷12.5%)
(4)(
+
)×12-
.
(1)12×(87+368÷16)
(2)
2 |
5 |
2 |
3 |
6 |
7 |
1 |
2 |
(3)10.6-(6.6+
1 |
8 |
(4)(
1 |
12 |
3 |
47 |
36 |
47 |
分析:(1)先算括号里面的除法,再算括号里面的加法,最后算括号外面的乘法;
(2)乘除法同时脱式,再算加法;
(3)先算括号里面的除法,再算括号里面的加法,最后算括号外面的减法;
(4)运用乘法分配律简算.
(2)乘除法同时脱式,再算加法;
(3)先算括号里面的除法,再算括号里面的加法,最后算括号外面的减法;
(4)运用乘法分配律简算.
解答:解:(1)12×(87+368÷16),
=12×(87+23),
=12×110,
=1320;
(2)
÷
+
×
,
=
×
+
×
,
=
+
,
=
;
(3)10.6-(6.6+
÷12.5%),
=10.6-(6.6+1),
=10.6-7.6,
=3;
(4)(
+
)×12-
,
=
×12+
×12-
,
=1+
-
,
=1.
=12×(87+23),
=12×110,
=1320;
(2)
2 |
5 |
2 |
3 |
6 |
7 |
1 |
2 |
=
2 |
5 |
3 |
2 |
6 |
7 |
1 |
2 |
=
3 |
5 |
3 |
7 |
=
36 |
35 |
(3)10.6-(6.6+
1 |
8 |
=10.6-(6.6+1),
=10.6-7.6,
=3;
(4)(
1 |
12 |
3 |
47 |
36 |
47 |
=
1 |
12 |
3 |
47 |
36 |
47 |
=1+
36 |
47 |
36 |
47 |
=1.
点评:本题考查了整数、分数和小数的四则混合运算,注意运算顺序和运算法则,并灵活运用所学的运算定律进行简便计算.
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