题目内容

①84
18
19
×10.375+105
1
19
×
3
8
②132
1
130
÷
131
③19931993×1993-19931992×1992-19931992
276+543×275
276×543-267
7
6
+
13
12
+
21
20
+
31
30
+
43
42
+
57
56
+
73
72
+
91
90
(1)84
18
19
×10.375+105
1
19
×
3
8

=84
18
19
×(10+
3
8
)+105
1
19
×
3
8

=84
18
19
×10+
3
8
×84
18
19
+105
1
19
×
3
8

=(85-
1
19
)×10+(84
18
19
+105
1
19
)×
3
8

=850-
10
19
+190×
3
8

=850-
10
19
+71
1
4

=850+71
1
4
-
10
19

=921
1
4
-
10
19

=920
55
76


(2)132
1
130
÷
131,
=
132×130+1
130
×
1
131

=
132×130+1
130×131

=
131×131
130×131

=
131
130


(3)19931993×1993-19931992×1992-19931992,
=(19931992+1)×1993-19931992×1992-19931992,
=19931992×1993-19931992×1992-19931992+1993,
=19931992×(1993-1992-1)+1993,
=19931992×0+1993,
=1993;

(4)
276+543×275
276×543-267

=
276+543×275
(275+1)×543-267

=
276+543×275
275×543+543-267

=
276+543×275
275×543+275

=1;

(5)
7
6
+
13
12
+
21
20
+
31
30
+
43
42
+
57
56
+
73
72
+
91
90

=1+
1
6
+1+
1
12
+1+
1
20
+1+
1
30
+1+
1
42
+1+
1
56
+1+
1
72
+1+
1
90

=(1++1+1+1+1+1+1+1)+(
1
6
+
1
12
+
1
20
+
1
30
+
1
42
+
1
56
+
1
72
+
1
90
),
=8+(
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
+
1
6
-
1
7
+
1
7
-
1
8
+
1
8
-
1
9
+
1
9
-
1
10
),
=8+(
1
2
-
1
10
),
=8+
2
5

=8
2
5
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