题目内容
计算下面各题.
| [
| ||||||||||||||||
| 168.1÷(4.3×2-0.4) | ||||||||||||||||
15×
| 3.64×[1÷(
|
考点:分数的四则混合运算,小数四则混合运算
专题:运算顺序及法则
分析:(1)先算加法,再算乘法,最后算除法;
(2)先算小括号里面的减法,再算中括号里面的减法,最后算乘法;
(3)先算减法,再算乘法,最后算除法;
(4)先算乘法,再算减法,最后算除法;
(5)先算乘法,再算加法;
(6)先算减法,再算除法,最后算乘法.
(2)先算小括号里面的减法,再算中括号里面的减法,最后算乘法;
(3)先算减法,再算乘法,最后算除法;
(4)先算乘法,再算减法,最后算除法;
(5)先算乘法,再算加法;
(6)先算减法,再算除法,最后算乘法.
解答:
解:(1)
×(
+
)÷
=
×
÷
=
÷
=
;
(2)[
-(
-
)]×
=[
-
]×
=
×
=
;
(3)
÷[(
-
)×
]
=
÷[
×
]
=
÷
=8;
(4)168.1÷(4.3×2-0.4)
=168.1÷(8.6-0.4)
=168.1÷8.2
=20.5;
(5)15×
+
×16
=
+
=
;
(6)3.64×[1÷(
-2.09)]
=3.64×[1÷0.01]
=3.64×100
=364.
| 5 |
| 8 |
| 2 |
| 5 |
| 1 |
| 3 |
| 2 |
| 3 |
=
| 5 |
| 8 |
| 11 |
| 15 |
| 2 |
| 3 |
=
| 11 |
| 24 |
| 2 |
| 3 |
=
| 11 |
| 16 |
(2)[
| 5 |
| 6 |
| 5 |
| 14 |
| 2 |
| 7 |
| 7 |
| 18 |
=[
| 5 |
| 6 |
| 1 |
| 14 |
| 7 |
| 18 |
=
| 16 |
| 21 |
| 7 |
| 18 |
=
| 8 |
| 27 |
(3)
| 6 |
| 7 |
| 11 |
| 12 |
| 3 |
| 4 |
| 9 |
| 14 |
=
| 6 |
| 7 |
| 1 |
| 6 |
| 9 |
| 14 |
=
| 6 |
| 7 |
| 3 |
| 28 |
=8;
(4)168.1÷(4.3×2-0.4)
=168.1÷(8.6-0.4)
=168.1÷8.2
=20.5;
(5)15×
| 4 |
| 21 |
| 8 |
| 7 |
=
| 20 |
| 7 |
| 128 |
| 7 |
=
| 148 |
| 7 |
(6)3.64×[1÷(
| 21 |
| 10 |
=3.64×[1÷0.01]
=3.64×100
=364.
点评:考查了四则混合运算,注意运算顺序和运算法则,然后再进一步计算.
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