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下面各题怎样算简便就怎样算.149+587+5185×34+15×75%2.7÷(4-82%-18%)517÷9+19×1217(1112-34)÷(2-12)

题目详情
下面各题怎样算简便就怎样算.
149+587+51 85×
3
4
+15×75%
2.7÷(4-82%-18%)
5
17
÷9+
1
9
×
12
17
11
12
-
3
4
)÷(2-
1
2
3
4
-0.85+25%
▼优质解答
答案和解析
(1)149+587+51,
=149+51+587,
=200+587,
=787;

(2)85×
3
4
+15×75%,
=(85+15)×75%,
=100×75%,
=75;

(3)2.7÷(4-82%-18%),
=2.7÷[4-(82%+18%)],
=2.7÷[4-1],
=2.7÷3,
=0.9;

(4)
5
17
÷9+
1
9
×
12
17

=(
5
17
+
12
17
)×
1
9

=1×
1
9

=
1
9


(5)(
11
12
-
3
4
)÷(2-
1
2
),
=
1
6
÷1
1
2

=
1
9


(6)
3
4
-0.85+25%,
=
3
4
+25%-0.85,
=1-0.85,
=0.15.