第1题:
2/3,5/7,8/11,11/15,( )
A.14/19
B.7/9
C.13/21
D.1
第2题:
:2/5,5/8,8/11,( )
A.5/6
B.11/14
C.6/7
D.13/15
第3题:
3,15,7,12,11,9,15,( )。
A.6
B.8
C.18
D.19
第4题:
7, 8, 11, 7, 15, ( ), 19,5
A.8
B.6
C.11
D.19
第5题:
3/7,5/8,5/9,8/11,7/11,( )
A.11/14;B.10/13;C.15/17;D.11/12;
选A,奇数项:3/7,5/9,7/11 分子,分母都是等差,公差是2,偶数项:5/8,8/11,11/14 分子、分母都是等差数列,公差是3
第6题:
计算:
(1)(-8)-(-1) (2)45+(-30)
(3)-1.5-(-11.5) (4)-1/4-(-1/2)
(5)15-[1-(-20-4)] (6)-40-28-(-19)+(-24)
(7)22.54+(-4.4)+(-12.54)+4.4
(8) (2/3-1/2)-(1/3-5/6)
(9)2.4-(-3/5)+(-3.1)+4/5 (10)(-6/13)+(-7/13)-(-2)
(11)3/4-(-11/6)+(-7/3)
(12)11+(-22)-3×(-11)
(13)(-0.1)÷1/2×(-100)
(14)(-3/4)×(-2/3 - 1/3) ×0
(15)(-2)3-32
(16)23÷[(-2)3-(-4)]
(17)(3/4-7/8)÷(-7/8)
(18)(-60)×(3/4+5/6)
(1)(-8)-(-1)=-7
(2)45+(-30)=15
(3)-1.5-(-11.5)=10
(4)-1/4-(-1/2)=1/4
(5)15-[1-(-20-4)]=-10 (6)-40-28-(-19)+(-24)=-73
(7)22.54+(-4.4)+(-12.54)+4.4=10
(8) (2/3-1/2)-(1/3-5/6)=-1
(9)2.4-(-3/5)+(-3.1)+4/5=0.7 (10)(-6/13)+(-7/13)-(-2)=1
(11)3/4-(-11/6)+(-7/3)=1/4
(12)11+(-22)-3×(-11)=22
(13)(-0.1) ÷1/2×(-100)=20
(14)(-3/4) ×(-2/3 - 1/3) ×0=0
(15)(-2)3-32=-17
(16)23÷[(-2)3-(-4)]=-23/4
(17)(3/4-7/8) ÷(-7/8)=1/7
(18)(-60) ×(3/4+5/6)=-95
第7题:
7,8,11,7,15,( ),19,5
A.8 B.6 C.11 D.19
第8题:
A、3%-5%
B、7%-10%
C、11%-15%
D、17%一19%
第9题:
2,3,5,7,11,13,( ),19,…
A.15
B.16
C.17
D.18
第10题:
5 7 8 11 15 ( )
A.19
B.20
C.22
D.27