题目内容
计算下面各题,能简算的要简算
×0.125×
×40;
×
+
÷4; 15÷
+
×12;[1-(
-
)]÷
.
| 7 |
| 5 |
| 6 |
| 7 |
| 4 |
| 9 |
| 1 |
| 4 |
| 4 |
| 9 |
| 5 |
| 2 |
| 1 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
| 5 |
| 6 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)可根据乘法交换律与结合律计算.
(2)可先算乘法与除法,再算加法.
(3)先算除法与乘法,再算加法.
(4)先算小括号中的减法,再算中括号中的减法,最后算除法.
(2)可先算乘法与除法,再算加法.
(3)先算除法与乘法,再算加法.
(4)先算小括号中的减法,再算中括号中的减法,最后算除法.
解答:
解:(1)
×0.125×
×40
=
×
×(40×0.125)
=
×5
=6;
(2)
×
+
÷4
=
+
=
;
(3)15÷
+
×12
=6+2
=8;
(4)[1-(
-
)]÷
=[1-
]÷
=
÷
=
.
| 7 |
| 5 |
| 6 |
| 7 |
=
| 7 |
| 5 |
| 6 |
| 7 |
=
| 6 |
| 5 |
=6;
(2)
| 4 |
| 9 |
| 1 |
| 4 |
| 4 |
| 9 |
=
| 1 |
| 9 |
| 1 |
| 9 |
=
| 2 |
| 9 |
(3)15÷
| 5 |
| 2 |
| 1 |
| 6 |
=6+2
=8;
(4)[1-(
| 3 |
| 4 |
| 2 |
| 3 |
| 5 |
| 6 |
=[1-
| 1 |
| 12 |
| 5 |
| 6 |
=
| 11 |
| 12 |
| 5 |
| 6 |
=
| 11 |
| 10 |
点评:当算式中同时含有小括号与中括号时,要注意先算小括号里面的,再算中括号里面的.
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