题目内容
脱式计算.(能简算的要简算)
|
16×(
| ||||||||||||||||
|
|
分析:(1)先把除法变成乘法,再运用乘法分配律简算;
(2)运用乘法分配律简算;
(3)先把除法变成乘法,再运用乘法结合律简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算乘法.
(2)运用乘法分配律简算;
(3)先把除法变成乘法,再运用乘法结合律简算;
(4)先算小括号里面的减法,再算括号外的除法,最后算乘法.
解答:解:(1)
×
-
÷
,
=
×
-
×
,
=
×(
-
),
=
×
,
=
;
(2)16×(
+
-
),
=16×
+16×
-16×
,
=2+4-3,
=3;
(3)
÷
×
÷
,
=
×
×
×14,
=(
×
)×(
×14),
=
×
,
=
;
(4)
÷(
-
)×
,
=
÷
×
,
=
×
,
=6.
| 3 |
| 4 |
| 14 |
| 15 |
| 3 |
| 4 |
| 15 |
| 2 |
=
| 3 |
| 4 |
| 14 |
| 15 |
| 3 |
| 4 |
| 2 |
| 15 |
=
| 3 |
| 4 |
| 14 |
| 15 |
| 2 |
| 15 |
=
| 3 |
| 4 |
| 12 |
| 15 |
=
| 3 |
| 5 |
(2)16×(
| 1 |
| 8 |
| 1 |
| 4 |
| 3 |
| 16 |
=16×
| 1 |
| 8 |
| 1 |
| 4 |
| 3 |
| 16 |
=2+4-3,
=3;
(3)
| 1 |
| 3 |
| 5 |
| 6 |
| 9 |
| 28 |
| 1 |
| 14 |
=
| 1 |
| 3 |
| 6 |
| 5 |
| 9 |
| 28 |
=(
| 1 |
| 3 |
| 6 |
| 5 |
| 9 |
| 28 |
=
| 2 |
| 5 |
| 9 |
| 2 |
=
| 9 |
| 5 |
(4)
| 3 |
| 5 |
| 3 |
| 4 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 3 |
| 5 |
| 1 |
| 12 |
| 5 |
| 6 |
=
| 36 |
| 5 |
| 5 |
| 6 |
=6.
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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