Given that a + B is greater than or equal to 1, less than or equal to 5, A-B is greater than or equal to - 1, less than or equal to 3, find the value range of 3a-2b

Given that a + B is greater than or equal to 1, less than or equal to 5, A-B is greater than or equal to - 1, less than or equal to 3, find the value range of 3a-2b

3a-2b=1/2(a+b)+5/2(a-b)
1/2 < 1/2(a+b) < 5/2
-5/2 < 5/2(a-b) < 15/2
-2< 3a-2b

Given Z1 = 3 + 2I, Z2 = 1-4i, calculate z1-z2, z1z2

Z1-Z2=2+6i .Z1*Z2=-5-10i

There are pears in the fruit shop, which are 100 kg more than apples. After one third of pears are sold, the weight of apples is 25 kg more than pears. How many kg of pears are there?

Let X be the weight of the apple, and the equation 100 + x = (x + 25) / (1-1 / 3) can be given. If x = 125, the weight of the pear = 125 + 100 = 225 kg

How much is 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 added to 50

（1+50）*50/2=1275

Using branch current method to solve the branch current I1, I2, I3 in the circuit shown in Figure 1

Suppose that the current in the 1 ohm resistor above point a in the figure is I0 (the direction is taken as downward), then for point a, there is I2 = 7 A + I0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Equation 1, for the lower end of the 2 ohm resistor below the current source in the figure, there is I3 = I1 + 7 A - - - - - - - - - - - - - - - - -

90 people from grade four visited the science and Technology Museum, 42 of them took buses, and the rest were divided into 6 vans. How many people did each van take on average

90-42÷6＝8

1+2+3+4+.100=?

5050
Gauss's algorithm: (1 + 100) + (2 + 99)
How many 101? 101 numbers, two in pairs, 50 teams
101×50=5050

How do matrices multiply
5 -1 1 2
-2 0 -2 4
3 2
It's a mess to give a formula or something

First, suppose you know the row vector times the column vector
If C = a * B, then the I th row of a multiplied by the j th column of B is C (I, J)

"Another visit to Taohuayuan" and "a tale of Taohuayuan" both describe Taohuayuan gracefully. What is the difference between the thoughts and feelings expressed in the two articles?
Basic training of Grade 8

Another visit to Taohuayuan expresses the author's love for the beautiful natural scenery and the joy of touring. Taohuayuan expresses the author's political ideal: there is no war, no oppression, people live and work in peace and tranquility, Another visit to Taohuayuan does not have much yearning and love. However, the beautiful scenery of Taohuayuan is in sharp contrast with the real society, which shows the author's yearning and love for a better world. It represents different meanings, one is to describe the real life and the other is to yearn for a better life

lim(X-0) sin^2x/(x^2+x^3)=?

Sin & # 178; X / (X & # 178; + X & # 179;) = (SiNx / x) &# 178; (1 + x), when x → 0, (SiNx) / X → 1 and 1 + X → 1, then the value of this limit is 1