题目内容
能简算的要简算.
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分析:(1)(4)(6)按照从左到右的顺序计算;
(2)运用乘法分配律简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(5)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法.
(2)运用乘法分配律简算;
(3)先把除法变成乘法,再运用乘法分配律简算;
(5)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法.
解答:解:(1)
×
÷
,
=
×
,
=
;
(2)
×101-
,
=
×(101-1),
=
×100,
=70;
(3)
÷23+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)
×
÷
,
=
×
,
=
;
(5)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=3;
(6)
×
×6,
=
×6,
=
.
| 3 |
| 4 |
| 7 |
| 12 |
| 14 |
| 9 |
=
| 7 |
| 16 |
| 9 |
| 14 |
=
| 9 |
| 32 |
(2)
| 7 |
| 10 |
| 7 |
| 10 |
=
| 7 |
| 10 |
=
| 7 |
| 10 |
=70;
(3)
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=
| 8 |
| 17 |
| 1 |
| 23 |
| 1 |
| 23 |
| 9 |
| 17 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=1×
| 1 |
| 23 |
=
| 1 |
| 23 |
(4)
| 17 |
| 12 |
| 3 |
| 34 |
| 2 |
| 19 |
=
| 1 |
| 8 |
| 19 |
| 2 |
=
| 19 |
| 16 |
(5)
| 1 |
| 5 |
| 1 |
| 13 |
| 1 |
| 5 |
| 2 |
| 3 |
=
| 1 |
| 5 |
| 1 |
| 13 |
| 13 |
| 15 |
=
| 1 |
| 5 |
| 1 |
| 15 |
=3;
(6)
| 11 |
| 36 |
| 9 |
| 22 |
=
| 1 |
| 8 |
=
| 3 |
| 4 |
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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