1. If (x+y): (x-y) = 3: 1, then x: y = ().
a、3∶ 1 B、2∶ 1 C、 1∶ 1 D、 1∶2
2. If the solution of equation -2x+ m=-3 is 3, then the value of m is ().
a、6 B、-6 C、D、- 18
3. In the equation 6x+ 1= 1, 2x=, 7x- 1=x- 1, 5x=2-x, the number of solving equations is ().
a， 1 b，2 c，3 d，4
4. According to the quantitative relationship of "the difference between the absolute value of 3 times a and -4 is equal to 9", equation () can be obtained.
a 、|3a-(-4)|=9 B 、|3a-4|=9
c、3|a|-|-4|=9 D、3a-|-4|=9
5. If the solution of the equation =4(x- 1) about x is x=3, then the value of a is ().
a、2 B、22 C、 10 D 、-2
[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3)
68/2 1-8- 1 1*8+6 1
-2/9-7/9-56
4.6-(-3/4+ 1.6-4-3/4)
1/2+3+5/6-7/ 12
[2/3-4- 1/4*(-0.4)]/ 1/3+2
22+(-4)+(-2)+4*3
-2*8-8* 1/2+8/ 1/8
(2/3+ 1/2)/(- 1/ 12)*(- 12)
(-28)/(-6+4)+(- 1)
2/(-2)+0/7-(-8)*(-2)
18-6/(-3)*(-2)
(5+3/8*8/30/(-2)-3
(-84)/2*(-3)/(-6)
- 1+2-3+4-5+6-7
-50-28+(-24)-(-22)
- 19.8-(-20.3)-(+20.2)- 10.8
0.25- +(- 1 )-(+3 )
- 1-〔 1-( 1-0.6÷3)〕×〔2-(-3)×(-4)〕
0÷(-4)-42-(-8)÷(- 1)3
-32-(-3) 2-(-3)3+(- 1)6
3×(-2)2+(-2×3)2+(-2+3)2
(- 12)÷4×(-6)÷2
(- 12)÷4×(-6)×2
75÷〔 138÷( 100-54)〕
80400-(4300+870÷ 15)
1437×27+27×563
〔75-( 12+ 18)〕÷ 15
2 160÷〔(83-79)× 18〕
280+840÷24×5
325÷ 13×(266-250)
85×(95- 1440÷24)
58870÷( 105+20×2)
1437×27+27×563
8 1432÷( 13×52+78)
[37.85-(7.85+6.4)] ×30
156×[( 17.7-7.2)÷3]
(947-599)+76×64
36×(9 13-276÷23)
-(3.4 1.25×2.4)
(3 1.8 3.2×4)÷5
194-64.8÷ 1.8×0.9 36.72÷4.25×9.9
3.4 16÷(0.0 16×35)
0.8×[( 10-6.76)÷ 1.2]
( 136+64)×(65-345÷23)
(6.8-6.8×0.55)÷8.5
0. 12× 4.8÷0. 12×4.8
(58+37)÷(64-9×5)
8 12-700÷(9+3 1× 1 1)
120-36×4÷ 18+35
(284+ 16)×(5 12-8208÷ 18)
9.72× 1.6- 18.305÷7
4/7÷[ 1/3×(3/5-3/ 10)]
(4/5+ 1/4)÷7/3+7/ 10
12.78-0÷( 13.4+ 156.6 )
37.8 12-700÷(9+3 1× 1 1)
( 136+64)×(65-345÷23)
3.2×( 1.5+2.5)÷ 1.6
85+ 14×( 14+208÷26)
(58+37)÷(64-9×5)
(6.8-6.8×0.55)÷8.5
(284+ 16)×(5 12-8208÷ 18)
0. 12× 4.8÷0. 12×4.8
(3.2× 1.5+2.5)÷ 1.6
120-36×4÷ 18+35
10. 15- 10.75×0.4-5.7
5.8×(3.87-0. 13)
+4.2×3.74 347+45×2-4 160÷52
32.52-(6+9.728÷3.2)×2.5 87(58+37)÷(64-9×5)
[(7. 1-5.6)×0.9- 1. 15] ÷2.5 (3.2× 1.5+2.5)÷ 1.6
5.4÷[2.6×(3.7-2.9)+0.62] 12×6÷( 12-7.2)-6
3.2×6+( 1.5+2.5)÷ 1.6 (3.2× 1.5+2.5)÷ 1.6
5.8×(3.87-0. 13)+4.2×3.74
33.02-( 148.4-90.85)÷2.5