用递等式计算,能简算的要简算(1)18-10.4÷(6.2-4.9)(2) 6 5 - 2 7 + 4 5 - 5 7

用递等式计算,能简算的要简算
(1)18-10.4÷(6.2-4.9)
(2)
6
5
-
2
7
+
4
5
-
5
7

(3)2-
8
9
÷
5
4
×
3
16

(4)3.6÷0.4+1.3×5
(5)[6.85-(0.75+0.2)]÷0.5
(6)
3
4
÷[56×(
3
7
-
3
8
)].
muzhi889 1年前 已收到1个回答 举报

feewfwef 幼苗

共回答了15个问题采纳率:93.3% 举报

(1)18-10.4÷(6.2-4.9),
=18-10.4÷1.3,
=18-8,
=10;

(2)
6
5 -
2
7 +
4
5 -
5
7 ,
=(
6
5 +
4
5 )-(
2
7 +
5
7 ),
=2-1,
=1;

(3)2-
8
9 ÷
5
4 ×
3
16 ,
=2-
8
9 ×
4
5 ×
3
16 ,
=2-
32
45 ×
3
16 ,
=2-
2
15 ,
=1
13
15 ;

(4)3.6÷0.4+1.3×5,
=9+1.3×5,
=9+6.5,
=15.5;

(5)[6.85-(0.75+0.2)]÷0.5,
=[6.85-0.95]÷0.5,
=5.9÷0.5,
=11.8;

(6)
3
4 ÷[56×(
3
7 -
3
8 )],
=
3
4 ÷[56×
3
7 -56×
3
8 ],
=
3
4 ÷[24-21],
=
3
4 ÷3,
=
1
4 .

1年前

1
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