题目内容
计算:
2108+540÷18×24;
8.2-0.6×(0.9-0.75);
(2
-
×1
)÷13;
6.3÷[(4
-0.07×50)÷1
].
2108+540÷18×24;
8.2-0.6×(0.9-0.75);
(2
1 |
3 |
8 |
15 |
2 |
3 |
6.3÷[(4
1 |
7 |
2 |
7 |
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)先算除法和乘法,再算加法.
(2)先算括号内的,再算括号外的乘法,最后算减法.
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法.
(4)先算小括号内的乘法,再算小括号内的减法,然后算中括号内的除法,最后算括号外的除法.
(2)先算括号内的,再算括号外的乘法,最后算减法.
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法.
(4)先算小括号内的乘法,再算小括号内的减法,然后算中括号内的除法,最后算括号外的除法.
解答:
解:(1)2108+540÷18×24
=2108+30×24
=2108+720
=2828
(2)8.2-0.6×(0.9-0.75)
=8.2-0.6×0.15
=8.2-0.09
=8.11
(3)(2
-
×1
)÷13
=(2
-
×
)÷13
=(2
-
)÷13
=
÷13
=
(4)6.3÷[(4
-0.07×50)÷1
]
=6.3÷[(4
-3.5)÷1
]
=6.3÷[(4
-3
)÷1
]
=6.3÷[
×
]
=6.3÷
=12.6
=2108+30×24
=2108+720
=2828
(2)8.2-0.6×(0.9-0.75)
=8.2-0.6×0.15
=8.2-0.09
=8.11
(3)(2
1 |
3 |
8 |
15 |
2 |
3 |
=(2
1 |
3 |
8 |
15 |
5 |
3 |
=(2
1 |
3 |
8 |
9 |
=
13 |
9 |
=
1 |
9 |
(4)6.3÷[(4
1 |
7 |
2 |
7 |
=6.3÷[(4
1 |
7 |
2 |
7 |
=6.3÷[(4
1 |
7 |
1 |
2 |
2 |
7 |
=6.3÷[
9 |
14 |
7 |
9 |
=6.3÷
1 |
2 |
=12.6
点评:此题主要考查了分数的四则运算的运算顺序和运算法则.
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