计算下面各题,能用简便算法的就用简便算法.(1)710÷9+310×19(2)75-58-916÷32(3)(34-18)÷512(4)45÷[(12+25)×23].-数学

题目简介

计算下面各题,能用简便算法的就用简便算法.(1)710÷9+310×19(2)75-58-916÷32(3)(34-18)÷512(4)45÷[(12+25)×23].-数学

题目详情

计算下面各题,能用简便算法的就用简便算法.
(1)
7
10
÷9+
3
10
×
1
9
(2)
7
5
-
5
8
-
9
16
÷
3
2
(3)(
3
4
-
1
8
÷
5
12
(4)
4
5
÷[(
1
2
+
2
5
2
3
]
题型:解答题难度:中档来源:不详

答案

(1)class="stub"7
10
÷9+class="stub"3
10
×class="stub"1
9

=class="stub"7
10
×class="stub"1
9
+class="stub"3
10
×class="stub"1
9

=(class="stub"7
10
+class="stub"3
10
)×class="stub"1
9

=1×class="stub"1
9

=class="stub"1
9


(2)class="stub"7
5
-class="stub"5
8
-class="stub"9
16
÷class="stub"3
2

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

=class="stub"7
5
-(class="stub"5
8
+class="stub"3
8
),
=class="stub"7
5
-1,
=class="stub"2
5


(3)(class="stub"3
4
-class="stub"1
8
÷class="stub"5
12

=class="stub"5
8
÷class="stub"5
12

=class="stub"3
2


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

=class="stub"4
5
÷[class="stub"9
10
×class="stub"2
3
]

=class="stub"4
5
÷class="stub"3
5

=class="stub"4
3

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