脱式计算.12÷[(58-12)×13](23-47)×21+45(7-6×23)÷79(78-14)÷(59-13).-数学

题目简介

脱式计算.12÷[(58-12)×13](23-47)×21+45(7-6×23)÷79(78-14)÷(59-13).-数学

题目详情

脱式计算.
1
2
÷[(
5
8
-
1
2
1
3
]
(
2
3
-
4
7
)×21+
4
5
(7-6×
2
3
7
9
(
7
8
-
1
4
)÷(
5
9
-
1
3
)
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
2
÷[(class="stub"5
8
-class="stub"1
2
)×class="stub"1
3
]

=class="stub"1
2
÷[class="stub"1
8
×class="stub"1
3
]

=class="stub"1
2
÷class="stub"1
24

=12;

(2)(class="stub"2
3
-class="stub"4
7
)×21+class="stub"4
5

=class="stub"2
3
×21-class="stub"4
7
×21+class="stub"4
5

=14-12+class="stub"4
5

=2+class="stub"4
5

=2class="stub"4
5


(3)(7-6×class="stub"2
3
)÷class="stub"7
9

=(7-4)÷class="stub"7
9

=3÷class="stub"7
9

=class="stub"27
7


(4)(class="stub"7
8
-class="stub"1
4
)÷(class="stub"5
9
-class="stub"1
3
)

=class="stub"5
8
÷class="stub"2
9

=class="stub"45
16

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