题目内容
脱式计算.
| 360÷15-2.5×1.4 | 0.16+4÷(
|
43×99+43 | ||||||||||||||||||||||||
(
|
|
|
考点:分数的四则混合运算,整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:(1)先算除法和乘法,再算减法;
(2)先算减法,再算除法,最后算加法;
(3)根据乘法分配律进行简算;
(4)先算乘法和除法,再算加法;
(5)根据加法交换律和结合律进行简算;
(6)先算加法,再算乘法,最后算除法.
(2)先算减法,再算除法,最后算加法;
(3)根据乘法分配律进行简算;
(4)先算乘法和除法,再算加法;
(5)根据加法交换律和结合律进行简算;
(6)先算加法,再算乘法,最后算除法.
解答:
解:(1)360÷15-2.5×1.4
=24-3.5
=20.5;
(2)0.16+4÷(
-
)
=0.16+4÷
=0.16+16
=16.16;
(3)43×99+43
=43×(99+1)
=43×100
=4300;
(4)
×
+
÷
=
+
=
;
(5)
-
+
-
=(
+
)-(
+
)
=1-1
=0;
(6)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=
.
=24-3.5
=20.5;
(2)0.16+4÷(
| 3 |
| 8 |
| 1 |
| 8 |
=0.16+4÷
| 1 |
| 4 |
=0.16+16
=16.16;
(3)43×99+43
=43×(99+1)
=43×100
=4300;
(4)
| 5 |
| 6 |
| 2 |
| 3 |
| 4 |
| 9 |
| 1 |
| 6 |
=
| 5 |
| 9 |
| 8 |
| 3 |
=
| 29 |
| 9 |
(5)
| 3 |
| 7 |
| 2 |
| 5 |
| 4 |
| 7 |
| 3 |
| 5 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 2 |
| 5 |
| 3 |
| 5 |
=1-1
=0;
(6)
| 4 |
| 15 |
| 2 |
| 5 |
| 1 |
| 10 |
| 2 |
| 3 |
=
| 4 |
| 15 |
| 1 |
| 2 |
| 2 |
| 3 |
=
| 4 |
| 15 |
| 1 |
| 3 |
=
| 4 |
| 5 |
点评:考查了运算定律与简便运算,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简便计算.
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