(1) If the reciprocal of a number is -2.5, then the number is--,|-3 | =--.
(2) 3.4 million is expressed as ————————————————————————————————————————————————————————————————————————————.
(3) If a=3, then | 5-a | +|1-a | = ———, () 2=64.
(4) The coefficient of the monomial -6x2y3z is —————————————————————.
5] Polynomial 2-3xy2+4x2 is a degree term. Its quadratic term is—.
[6] Simplification: 4xy-3 (2x+xy)-(2xy-x) = ———————.
Once the purchase price of a commodity is 40 yuan and the selling price is 60 yuan, the profit rate is.
(8) Calculation:-14-(-2) 2 = ———————.
(9) If the solution of equation ax-5=0 is known as x=, then a=————.
⑽ The standard form of the linear equation of one variable is ————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
⑾ When x= and y=2, the algebraic expression 2x2-y+3=——————.
⑿ If the algebraic expressions 2x+3 and 3x+2 are reciprocal, then x = x=——————.
[13] It is known that 3xny2 and -4x3ym are similar terms, so m = ———.
14. The solution of the one-dimensional linear equation 3x-2=7 is ———.
⒂ If A and B are reciprocal, and C and D are reciprocal, then 2A+2B+CD =-.
2) Multiple choice questions (3 points for each question, 30 points for * * *)
The solution of (1) equation y- =5 is ()
A.y=9，B.y=-9，C.y=3，D.y=-3 .
Three times a number minus six equals three, so the number is ().
A.0，B. 1，C.2，D.3
(3) If the sum of a polynomial and x2-2x+ 1 equals -3x+2, then the polynomial is ().
A.-x2+x+ 1 B.-x2+x- 1
C.-x2-x- 1 D.-x2-x+ 1
(4) The original cost of a product is P yuan. After technical transformation, the cost is reduced by 18%, and the current cost is ().
A.P( 1- 18%) B
C.p- 18d 18%
5] Remove the denominator of the equation -x+ 1=4, and the correct one is ().
a . 1-2x-x+ 1 = 12 b . 1-2x-3x+ 1 = 12
c . 1-2x-3x+3 = 12d . 1-2x-3x-3 = 12
[6] The following results are affirmative ()
A.-|-2 | b .-|-(-3)| c .-|-(+ 1)| d .-(-3)
(7) Approximation number is 2.30× 103. The number of significant digits reserved is ().
A. two b, three c, five d, six.
⑻ If a < 0, then 2a+5|a| is equal to: ()
A.7a，B.7a2，c-3a，d-7a .
Levies in the following equation, belongs to the linear equation is ()
A.5x+y= 1 B. +5x=3
C.x2-3x +2=0 D.x+2y=y+z
⑽ The following statement is wrong ()
A. Zero has no reciprocal, and B. Zero is the smallest non-negative number.
C. zero has no opposite number, and D. zero is not divisible.
(3) Solution (5 points for each question, * * * 25 points)
(1) calculation: -2 +(-3) -(- 1) ×( -0.5)÷.
(2) Simplified evaluation: (1-2a+a-5a)-(- a +2a-2a), where a=-3.
(3) Solve the equation: 4 (3y+1)-4 (y+2) = 3 (1-y).
(4) Solve the equation: -= 1
5] It is known that x=-4 is the solution of equation 3x+8= -m, so find the value of m-.
(4) Solve according to conditions and equations (5 points for each question, *** 15 points).
(1) x minus half the difference of 3 equals x plus 7.
(2) If a shopping mall sells a color TV at a 20% discount, it can still make a profit of 20%. If the purchase price of this color TV is 2000 yuan, what is the bid price?
(3) Xiao Wang originally planned to go from place A to place B in 4 hours. Because he was in a hurry, he accelerated to 3 kilometers per hour. As a result, he arrived in 3 hours, seeking Xiao Wang's original speed and the distance from A to B.
(5) Additional question: It is known that x=5 is the solution of equation ax-8=2m- 1, and m=2a, so find the values of a and m .. (5 points)