怎样算简便就怎样算.49×15÷45;(15-14×47)×821;45÷[(13+25)×411];18×58+42÷8;72×58-32÷85;34×40%+0.75×35.-数学

题目简介

怎样算简便就怎样算.49×15÷45;(15-14×47)×821;45÷[(13+25)×411];18×58+42÷8;72×58-32÷85;34×40%+0.75×35.-数学

题目详情

怎样算简便就怎样算.
4
9
×
1
5
÷
4
5
(15-14×
4
7
)×
8
21
4
5
÷[(
1
3
+
2
5
)×
4
11
];
1
8
×58+42÷8;
7
2
×
5
8
-
3
2
÷
8
5
3
4
×40%+0.75×
3
5
题型:解答题难度:中档来源:不详

答案

(1)class="stub"4
9
×class="stub"1
5
÷class="stub"4
5

=class="stub"4
9
×class="stub"1
5
×class="stub"5
4

=class="stub"1
9

(2)(15-14×class="stub"4
7
)×class="stub"8
21

=(15-8)×class="stub"8
21

=7×class="stub"8
21

=class="stub"8
3

(3)class="stub"4
5
÷[(class="stub"1
3
+class="stub"2
5
)×class="stub"4
11
]
=class="stub"4
5
÷[class="stub"11
15
×class="stub"4
11
]
=class="stub"4
5
÷class="stub"4
15

=class="stub"4
5
×class="stub"15
4

=3
(4)class="stub"1
8
×58+42÷8
=class="stub"1
8
×58+42×class="stub"1
8

=class="stub"1
8
×(58+42)
=class="stub"1
8
×100
=12.5
(5)class="stub"7
2
×class="stub"5
8
-class="stub"3
2
÷class="stub"8
5

=class="stub"7
2
×class="stub"5
8
-class="stub"3
2
×class="stub"5
8

=(class="stub"7
2
-class="stub"3
2
)×class="stub"5
8

=2×class="stub"5
8

=class="stub"5
4

(6)class="stub"3
4
×40%+0.75×class="stub"3
5

=class="stub"3
4
×class="stub"2
5
+class="stub"3
4
×class="stub"3
5

=class="stub"3
4
×(class="stub"2
5
+class="stub"3
5

=class="stub"3
4
×1
=class="stub"3
4

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