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一、口算。结果请用最简分数表示。
1111214173+= -= -= -= -= 23245577881252113121+ = -= += -= += 105633584335591421111-= -= -= + = -= 12121010556328331143755+= -= += 1-= += 8825778661-
531935535= += -= -= += 1252101077881713319193+= += += -= -= 612447210210558171913193
+ = + = - = + = 9988242436363411111123 + = - = - = - = 778849131384111311733
+ + = 1- - = + + = - + = 911966444888+-
= =
-=
+=
+= -=
二、计算(能简算的要简算)。
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53115311(1) - + (2)1- + (3) +2 -1
8104(4)53215 -23 +36 (7)2-178 -8 (10)93310 +20 -15 (13)256 -﹙273 +12 )(16)1.875+23 精品文档
2448452
(5)57 -415 +22332
7 -15 (6)4 -﹙4 -3
﹚
(8)4.75+538 -334 (9)411
5 -4 +3
(11)1-7327135
12 +4 (12)28 +﹙14 -7
﹚
(14)1514 -512 +756 (15)1511
6 -﹙33 -12
﹚17)1278+15+8 (18)5316+4-3
(精品文档
111173731
(19) - ( + ) (20)11- - (21) - ( - )
1212 -(34 -38 )1-
1718-118 710 -38 -18 11-
710 - 310 12 -(34 -38 ) 精品文档
6810101242
34+57+12 45+23+15425 17-51+3 733111553110-(7-10) 12+16+815 12 +4 +12 1118+215+78 56+34-13 12 - ( 16 + 18 ) 712 - ( 34 - 1133
2 ) 2 -(4 -8
) 516 -(3 +310 ) 2513 +6 - 6
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8284237111544
45 -(30 +8 ) 4 +6 +5 + 15 -3 -2 7.6+1 + + 1151124-(7579 +1212 ) 2三、解方程。
(1)3x-156 =16 (4)3134 -x=18 (7)X+227=3 精品文档
7979214 -13
16
+0.75
(2)7.5-x=214 (5)3x-445 =2-5 (8)X -136 =8 54959
3)41
3
+x=5
6)X-354=8
(9)125 +X=3
((