题目内容
灵活计算,(能简便计算的要用简便方法计算).
2-
÷
36×(
+
)
(
+
÷6)×
22.1-4.88-4.12.
2-
8 |
15 |
4 |
9 |
36×(
1 |
6 |
2 |
3 |
(
4 |
5 |
2 |
3 |
5 |
7 |
22.1-4.88-4.12.
分析:(1)先算除法,再算减法;
(2)运用乘法分配律简算;
(3)先算除法,再运用乘法分配律简算;
(4)根据连续减去两个数,等于减去这两个数的和简算.
(2)运用乘法分配律简算;
(3)先算除法,再运用乘法分配律简算;
(4)根据连续减去两个数,等于减去这两个数的和简算.
解答:解:(1)2-
÷
,
=2-
,
=
;
(2)36×(
+
),
=36×
+
×36,
=6+24,
=30;
(3)(
+
÷6)×
,
=(
+
)×
,
=
×
+
×
,
=
+
,
=
;
(4)22.1-4.88-4.12,
=22.1-(4.88+4.12),
=22.1-9,
=13.1.
8 |
15 |
4 |
9 |
=2-
6 |
5 |
=
4 |
5 |
(2)36×(
1 |
6 |
2 |
3 |
=36×
1 |
6 |
2 |
3 |
=6+24,
=30;
(3)(
4 |
5 |
2 |
3 |
5 |
7 |
=(
4 |
5 |
1 |
9 |
5 |
7 |
=
4 |
5 |
5 |
7 |
1 |
9 |
5 |
7 |
=
4 |
7 |
5 |
63 |
=
41 |
63 |
(4)22.1-4.88-4.12,
=22.1-(4.88+4.12),
=22.1-9,
=13.1.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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