一、口算。结果请用最简分数表示。
1+1=23
1+2=105
5-5=1212
3+3=88
1-5=12
1+7=612
59
+98
=
1-1=24
5-2=63
9-1=1010
1-1=25
3+1=52
1+3=44
18
+87
=
2-1=55
4-1=77
7-3=88
1+1=35
3-1=84
2+1=33
4-2=55
1+1=63
1-1=28
4+3=77
1-7=8
5+5=66
9-3=1010
5-5=77
3+5=88
3+1=72
9-1=102
9-3=105
1924
-1234
=
1936
+336
=
37
+74
=
118
-81
=
14
-91
=
1213
-133
=
89
+141
+91
=
1-16-16=
34
+14
+14
=
78
-38
+38
=
+=
-=
+=
-=
+=
-=
二、计算(能简算的要简算)。
(1)85-130+14
(2)1-214+458
(3)34+251-112
(4)535-232+361
(5)57-145+72-125
(6)34-34-32
(7)2-81-78
(8)+538-343
(9)45-14+13
(10)190+230-135
(11)1-172+34
(12)2278+1134-75
(13)256-23+172)(14)1541-512+756(15)156-331-112
(16)+32
(17)1278158
(18)53-1643
f(
19
)
1112
-
16
+
18
(20)11-
710
-
310
(
21
)
712
-
34
-
12
12
-(34
-83
)
1-17-11818
3+5+1472
7-3-310710
4+2+1535
5-4+217513
11+15+8121615
53112412
7311088
127
8158
53-1643
1112
-
16
+
18
11-
710
-
310
12
(43
38
)
712
-
34
-
12
56
(13
310
)
12
-(43
-38
)
23
56
-
16
82845113058115441959(1)3x-16=156
423747695795724791212(2)-x=241
11115235241324116(3)413+x=5
(4)314-x=138
(5)3x-54=2-54
(6)X-3548
(7)X2273
(8)X
-61
38
(9)51+X23
f127x3
X-3548
415x4
22
X
73
13x68
X
-16
38
15
+X23
fr