题目内容

能简算的一定要简算
10
11
×
1
13
×13×11
4
5
+
3
10
)×
10
3
13
49
×21+28×
13
49
39÷7+31×
1
7
3
4
+
5
8
)×32
99×
5
98
(1)
10
11
×
1
13
×13×11,
=(
10
11
×11)×(
1
13
×13),
=10×1,
=10;

(2)(
4
5
+
3
10
)×
10
3

=
4
5
×
10
3
+
3
10
×
10
3

=
8
3
+1,
=3
2
3


(3)
13
49
×21+28×
13
49

=
13
49
×(21+28),
=
13
49
×49,
=13;

(4)39÷7+31×
1
7

=39×
1
7
+31×
1
7

=(39+31)×
1
7

=70×
1
7

=10;

(5)(
3
4
+
5
8
)×32,
=
3
4
×32+
5
8
×32,
=24+20,
=44;

(6)99×
5
98

=(98+1)×
5
98

=98×
5
98
+1×
5
98

=5+
5
98

=5
5
98
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