问题 解答题
看谁算得准(能简算的要简算).
762-450÷18×25
1.5×(3.8-0.8)÷0.9
2
7
+
5
7
÷
1
8
(1-
1
100
×70)÷
2
7
5
7
÷[1÷(
2
3
-
1
5
)]
4
5
+(36+
9
5
)÷9.
答案

(1)762-450÷18×25

=762-625,

=137;

(2)1.5×(3.8-0.8)÷0.9,

=1.5×3÷0.9,

=5;

(3)8×

2
7
+
5
7
÷
1
8

=8×

2
7
+
5
7
×8,

=(

2
7
+
5
7
)×8,

=1×8,

=8;

(4)(1-

1
100
×70)÷
2
7

=(1-

7
10
÷
2
7

=

3
10
×
7
2

=

21
20

(5)

5
7
÷[1÷(
2
3
-
1
5
)]

=

5
7
÷[1÷
7
15
],

=

5
7
×
7
15

=

1
3

(6)

4
5
+(36+
9
5
)÷9

=

4
5
+36×
1
9
+
9
5
×
1
9

=

4
5
+
1
5
+4,

=5.

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