题目内容
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分析:(1)(5)按照从左到右顺序计算,
(2)(4)运用乘法分配律解答,
(3)按照先算乘法,再算减法顺序解答,
(6)按照先算括号里面的减法,再算括号外面的乘法顺序解答.
(2)(4)运用乘法分配律解答,
(3)按照先算乘法,再算减法顺序解答,
(6)按照先算括号里面的减法,再算括号外面的乘法顺序解答.
解答:解:(1)
×
×
=
×
=
;
(2)(
+
)×12
=
×12+
×12
=6+9
=15;
(3)
×
-
=
-
=
;
(4)
×7+
×4
=
×(7+4)
=
×11
=4;
(5)
×
×
=
×
=
;
(6)(
-
)×
=
×
=
.
| 2 |
| 3 |
| 5 |
| 6 |
| 9 |
| 10 |
=
| 5 |
| 9 |
| 9 |
| 10 |
=
| 1 |
| 2 |
(2)(
| 1 |
| 2 |
| 3 |
| 4 |
=
| 1 |
| 2 |
| 3 |
| 4 |
=6+9
=15;
(3)
| 4 |
| 7 |
| 3 |
| 8 |
| 1 |
| 7 |
=
| 3 |
| 14 |
| 1 |
| 7 |
=
| 1 |
| 14 |
(4)
| 4 |
| 11 |
| 4 |
| 11 |
=
| 4 |
| 11 |
=
| 4 |
| 11 |
=4;
(5)
| 3 |
| 5 |
| 6 |
| 7 |
| 20 |
| 27 |
=
| 18 |
| 35 |
| 20 |
| 27 |
=
| 8 |
| 21 |
(6)(
| 7 |
| 12 |
| 1 |
| 4 |
| 3 |
| 7 |
=
| 1 |
| 3 |
| 3 |
| 7 |
=
| 1 |
| 7 |
点评:(1)依据四则运算计算方法正确进行计算,(2)运用简便方法解决问题,是本题考查知识点.
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