题目内容
计算下面各题,能简便计算的要简便计算.
+
÷
×
3.7×
+1.3÷
6÷(
+
)
(
+
)×36 (13-
)÷(1-
) 1-(
-
)×
.
| 2 |
| 3 |
| 1 |
| 3 |
| 4 |
| 15 |
| 3 |
| 5 |
| 6 |
| 5 |
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
(
| 4 |
| 9 |
| 5 |
| 12 |
| 3 |
| 5 |
| 8 |
| 15 |
| 5 |
| 6 |
| 2 |
| 3 |
| 9 |
| 10 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算乘法,最后算加法;
(2)(4)利用乘法分配律简算;
(3)先算加法,再算除法;
(5)先算减法,再算除法;
(6)先算小括号里面的减法,再算乘法,最后算括号外面的减法.
(2)(4)利用乘法分配律简算;
(3)先算加法,再算除法;
(5)先算减法,再算除法;
(6)先算小括号里面的减法,再算乘法,最后算括号外面的减法.
解答:
解:(1)
+
÷
×
=
+
×
×
=
+
=
;
(2)3.7×
+1.3÷
=3.7×
+1.3×
=(3.7+1.3)×
=5×
=6;
(3)6÷(
+
)
=6×
=
;
(4)(
+
)×36
=
×36+
×36
=16+15
=31;
(5)(13-
)÷(1-
)
=
×
=
;
(6)1-(
-
)×
=1-
×
=1-
=
.
| 2 |
| 3 |
| 1 |
| 3 |
| 4 |
| 15 |
| 3 |
| 5 |
=
| 2 |
| 3 |
| 1 |
| 3 |
| 15 |
| 4 |
| 3 |
| 5 |
=
| 2 |
| 3 |
| 3 |
| 4 |
=
| 17 |
| 12 |
(2)3.7×
| 6 |
| 5 |
| 5 |
| 6 |
=3.7×
| 6 |
| 5 |
| 6 |
| 5 |
=(3.7+1.3)×
| 6 |
| 5 |
=5×
| 6 |
| 5 |
=6;
(3)6÷(
| 1 |
| 2 |
| 1 |
| 3 |
=6×
| 6 |
| 5 |
=
| 36 |
| 5 |
(4)(
| 4 |
| 9 |
| 5 |
| 12 |
=
| 4 |
| 9 |
| 5 |
| 12 |
=16+15
=31;
(5)(13-
| 3 |
| 5 |
| 8 |
| 15 |
=
| 62 |
| 5 |
| 15 |
| 7 |
=
| 186 |
| 7 |
(6)1-(
| 5 |
| 6 |
| 2 |
| 3 |
| 9 |
| 10 |
=1-
| 1 |
| 6 |
| 9 |
| 10 |
=1-
| 3 |
| 20 |
=
| 17 |
| 20 |
点评:分数混合运算的关键是抓住运算顺序,正确按运算顺序计算,适当利用运算定律简算.
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