The constant of the quadratic equation (A-3) x-3ax + 2A = 4 is 4. The number of quadratic terms and the coefficient of the first term are obtained

Because the constant term is 4
So 2A = 4, a = 2
The quadratic coefficient is 2-3 = - 1
The coefficient of the first term is - 3x2 = - 6

What is the relationship between the sum of two pairs, the product of two pairs and the coefficients of the equation?

Weida's theorem: in the quadratic equation AX & amp; sup2; + BX + C = 0, let two be X1 and x2
x1+x2=-b/a , x1×x2=c/a

What is the relationship between the sum and product of the two roots of the equation of X and the coefficients of the original equation

There should be some knowledge in the textbook, right

What is the dimension of solution space of linear equations

The dimension of solution space of homogeneous linear equations is the number of vectors contained in basic solution system
That is N-R (a)

There are 120 parts processed by Party A, Party B and Party C. the number of parts processed by Party A is one third of that of Party B, Party C and Party C,
The number of parts processed by Party B is 1 / 2 of the sum of Party B and Party C. how many parts have Party A, Party B and Party C processed respectively

A = 120 (1 + 1 / 3) × 1 / 3 = 30
B = 120 (1 + 1 / 2) × 1 / 2 = 40
C = 120-30-40 = 50

Solve equation 0.7x = 3.2 + 0.3 fast!

0.7x=3.2+0.3
0.7x=3.5
x=3.5÷0.7
x=5

There are 85 tons of grain in warehouse A and 75 tons in warehouse B. if we want to make the grain tonnage ratio of warehouse A and warehouse B be seven to nine, how many tons of grain should be transferred from warehouse A to warehouse B? Think about the grain tonnage of the two warehouses has changed, but nothing has changed

85-（85+75）×7/（7+9）
=85-70
=15 tons
Transfer 15 tons from a to B,
But the total amount of grain in the two warehouses has not changed
Warm cherry
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How much more is 24 times of 7 / 8 than 2 / 7 of 56

24 times 7 / 8 is 21
Two seventh of 56 is 16
So five more

[mathematical formula calculation] can be simple, to be simple
Come and help me!
4/9 X 7/11X 27X 44 28X（5/18 ÷ 35/27） 99X3/5 （5/6- 4/3）÷5/12
4/5+3/8X4/3-3/10 （1- 4/5X 1/12）÷1/3 （4/3+2/3+1/6）÷1/24 3.2X1.25X2.5
It's not a direct answer, it's a process

4/9X27X{7/11X44} 28X3/7 100X3/5-3/5 12/5X5/6-4/3X12/5
=12X28 =12 =60-3/5 =2-3.2
=336 =59.4 =-1.2
4/5+1/2-3-10 3-0.2 32+16+4 0.8X1.25X{4X2.5}
=0.8+0.2-0.3 =2.8 =52 =1X10
=0.7 =10

It is known that the sequence {an} is an equal ratio sequence whose every item is an integer, A3 = 4, and the sum of the first three terms of {an} is equal to 7. (1) the general term formula of {an}
This is the mathematics volume of the latest information volume (Hubei Standard Volume 8),

A1 + A2 = s3-a3 = 7-4 = 3a2 = A1 * QA3 = A1 * Q & # 178; A3 / (a1 + A2) = Q & # 178; / (1 + Q) = 4 / 3 get 3Q & # 178; - 4q - 4 = 0 (Q-2) (3Q + 2) = 0q = 2 or q = - 2 / 3 when q = 2, A1 = A3 / Q & # 178; = 4 / 4 = 1An = 1 * q ^ (n-1) = 2 ^ (n-1) when q = - 2 / 3, A4 = A3 * q

The constant of the quadratic equation (A-3) x-3ax + 2A = 4 is 4. The number of quadratic terms and the coefficient of the first term are obtained