题目内容
脱式计算,能简算的要简算.
(1)(
+
)÷
-
(2)10.6-(6.6+
÷12.5%)
(3)(
+
)÷
+
(4)
×
+
×
.
(1)(
1 |
2 |
1 |
3 |
2 |
5 |
2 |
3 |
(2)10.6-(6.6+
1 |
4 |
(3)(
4 |
5 |
1 |
4 |
7 |
3 |
7 |
10 |
(4)
15 |
16 |
5 |
6 |
5 |
6 |
1 |
16 |
分析:第(1)题注意通分、除以一个数等于乘以这个数的倒数;第(2)题利用减法的性质,去括号后,10.6与6.6结合;
第(3)题注意运算顺序和通分;第(4)题运用乘法分配律的逆运算进行计算.
第(3)题注意运算顺序和通分;第(4)题运用乘法分配律的逆运算进行计算.
解答:解:(1)(
+
)÷
-
,
=
×
-
,
=
-
,
=1
;
(2)10.6-(6.6+
÷12.5%),
=(10.6-6.6)-
×8,
=4-2,
=2;
(3)(
+
)÷
+
,
=
×
+
,
=
+
,
=1
;
(4)
×
+
×
,
=(
+
)×
,
=
.
1 |
2 |
1 |
3 |
2 |
5 |
2 |
3 |
=
5 |
6 |
5 |
2 |
2 |
3 |
=
25 |
12 |
8 |
12 |
=1
5 |
12 |
(2)10.6-(6.6+
1 |
4 |
=(10.6-6.6)-
1 |
4 |
=4-2,
=2;
(3)(
4 |
5 |
1 |
4 |
7 |
3 |
7 |
10 |
=
21 |
20 |
3 |
7 |
7 |
10 |
=
9 |
20 |
7 |
10 |
=1
3 |
20 |
(4)
15 |
16 |
5 |
6 |
5 |
6 |
1 |
16 |
=(
15 |
16 |
1 |
16 |
5 |
6 |
=
5 |
6 |
点评:此题考查了分数的通分、运算顺序、乘法分配律简算等知识,在解题时应灵活运用所学知识解答问题.
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