4Y+ 1 19=22
3X* 189=5
8Z/6=458
3X+77=59
4Y-6985=8 1
87X* 13=5
7Z/93=4 1
15X+863-65X=54
58Y*55=27489
z*(z-3)=4
The root of the equation x2 = is.
2. The general form of the equation (x+1) 2-2 (x-1) 2 = 6x-5 is.
3. One root of the quadratic equation x2+mx+3=0 about x is 1, so the value of m is.
4. Given that the quadratic trinomial x2+2mx+4-m2 is completely flat, then m=.
5. It is known that +(b- 1) 2 = 0. When k is, the equation kx2+ax+b=0 has two unequal real roots.
6. The equation mx2-2x+ 1 = 0 about x has only one real root, then m=.
7. Please write that one root is 1 and the other root satisfies-1
8. Equation X X2-(2m2+m-6) X-m= 0 If two mutually opposite numbers, then m=.
9. It is known that the two roots of the unary quadratic equation (A- 1) x2+x+A2- 1 = 0 are x 1, x2, x 1+x2=, then x 1, x2=.
Second, multiple-choice questions: (3 '× 8 = 24')
1 1, the equation about x (m+ 1) x2+2mx-3 = 0 is a quadratic equation, so the value of m is ().
A, any real number b, m≠ 1 C, m ≠- 1 d, m>- 1
12. The following is a fill-in-the-blank question that a classmate answered in a math exam. The correct answer is ().
A, if x2=4, then x=2 B, if 3x2=bx, then x=2.
C, x2+x-k=0, and one is 1, then k=2 D, and if the score is zero, then x=2.
13, the root of equation (x+3) (x-3) = 4 is ().
A, there is no real number root b, there are two unequal real number roots c, two are reciprocal d, and two are opposites.
The sum of all real roots of 14, unary quadratic equation x2-3x- 1 = 0, x2+4x+3=0 is equal to ().
a 、- 1 B 、-4 C、4 D、3
15, known equation () 2-5 ()+6 = 0, let =y become ().
a、y2+5y+6=0 B、y2-5y+6=0 C、y2+5y-6=0 D、y2-5y-6=0
16. The turnover of a supermarket in January was 1 10,000 yuan, and the turnover in the first quarter was * * * 8 million yuan. If the average monthly growth rate is x, the listed equation should be ().
a、 100( 1+x)2=800 B、 100+ 100×2x=800 C、 100+ 100×3x=800 D、 100[ 1+( 1+x)+( 1+x)2]
17, given that quadratic equation 2x2-3x+3=0, then ()
A, the sum of two roots is-1.5b, the difference between two roots is-1.5c, the product of two roots is-1.5d, and there is no real root.
18, A2+A2- 1 = 0, B2+B2- 1 = 0 and a≠b, then ab+a+b= ().
a、2 B、-2 C、- 1 D、0
Third, solve the following equations:
19 ,( x-2)2-3 = 0
20、x(8+x)= 16
2 1 、( 2x-3)2-2(2x-3)-3=0
22、2x2-5x+ 1=0
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This is someone else's answer, which is quite complete.