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脱式计算(能简算的要简算)3÷34-34÷3+33499×8798217+118×59+3858×5.3+5.7×58-0.625[(735×35+225÷123)÷13]÷13.

题目详情
脱式计算(能简算的要简算)
3
4
-
3
4
÷3+3
3
4
99×
87
98
2
1
7
+1
1
8
×
5
9
+
3
8
5
8
×5.3+5.7×
5
8
-0.625
[(7
3
5
×
3
5
+2
2
5
÷1
2
3
)÷
1
3
1
3
▼优质解答
答案和解析

(1)3÷
3
4
-
3
4
÷3+3
3
4

=4-
1
4
+3
3
4

=3
3
4
+3
3
4

=7
1
2


(2)99×
87
98

=(98+1)×
87
98

=98×
87
98
+1×
87
98

=87+
87
98

=87
87
98


(3)2
1
7
+1
1
8
×
5
9
+
3
8

=2
1
7
+
5
8
+
3
8

=2
1
7
+(
5
8
+
3
8
),
=2
1
7
+1,
=3
1
7


(4)
5
8
×5.3+5.7×
5
8
-0.625,
=
5
8
×5.3+5.7×
5
8
-
5
8

=(5.3+5.7-1)×
5
8

=10×
5
8

=
25
4


(5)[(7
3
5
×
3
5
+2
2
5
÷1
2
3
)÷
1
3
1
3

=[(7
3
5
×
3
5
+2
2
5
×
3
5
)÷
1
3
1
3

=[(7
3
5
+2
2
5
)×
3
5
÷
1
3
1
3

=[10×
3
5
÷
1
3
1
3

=[6÷
1
3
1
3

=18÷
1
3

=54.