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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