问题 解答题
452÷20+109×43=101×92-92=907×99+907=
274+299+201+326=6.5×99+6.5=31.25÷25×0.5=
3.8×4.2+38×0.58=13-
7
8
+
1
8
=
1
2
+
1
3
+
1
6
)×2×3×4=
3
7
×(
4
5
-
2
3
)÷
3
15
=
36÷[(
5
6
-
2
3
)×3]=
1
8
÷(
1
4
+2.5×
4
5
)=
答案

(1)452÷20+109×43

=22.6+4687,

=4709.6;

(2)101×92-92,

=(101-1)×92,

=100×92,

=9200;

(3)907×99+907,

=(99+1)×907,

=100×907,

=90700;

(4)274+299+201+326,

=(274+326)+(299+201),

=600+500,

=1100;

(5)6.5×99+6.5,

=(99+1)×6.5,

=100×6.5,

=650;

(6)31.25÷25×0.5,

=1.25÷0.5,

=2.5;

(7)3.8×4.2+38×0.58

=38×0.42+38×0.58

=(0.42+0.58)×38,

=1×0.38,

=38;

(8)13-

7
8
+
1
8

=12

1
8
+
1
8

=12

2
8

(9)(

1
2
+
1
3
+
1
6
)×2×3×4

=(

1
2
+
1
3
+
1
6
)×24,

=

1
2
×24+
1
3
×24+
1
6
×24,

=12+8+4,

=24;

(10)

3
7
×(
4
5
-
2
3
)÷
3
15

=

3
7
×(
4
5
×
15
3
-
2
3
×
15
3
),

=

3
7
×(
12
3
-
10
3
),

=

3
7
×
2
3

=

2
7

(11)36÷[(

5
6
-
2
3
)×3]

=36÷[

1
6
×3],

=36÷

1
2

=72;

(12)

1
8
÷(
1
4
+2.5×
4
5

=

1
8
÷[
1
4
+2],

=

1
8
×
4
9

=

1
18

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