题目内容

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
)=
(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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