If a is less than 0, then the solution set of the inequality system X is greater than - 2A and X is greater than - 3a is

If a is less than 0, then the solution set of the inequality system X is greater than - 2A and X is greater than - 3a is

The answer is that x is greater than - 3a, because a is less than 0, so - 2A < - 3a

Is there a real number a such that the set of integer solutions of the system of inequalities 2x (2) + (5 + 2a) x + 5A < 0; X (2) - X-2 > 0; is a single element set {- 2}?

The solution. X & sup2; - X-2 = (X-2) (x + 1) > 0 gives x > 2 or X

The solution set of inequality (2a-b) x + (- a-5b) > 0 about X is x < 73, then the solution set of inequality (3b-5a) x < 17a + B about X is x < 73______ ；

The solution set of (2a-b) x + (- a-5b) > 0, (2a-b) x > A + 5b, ∵ inequality is x < 73, ∵ can get 2a-b < 0, a + 5b2a − B = 73, ∵ can get a = 2B, B < 0, inequality (3b-5a) x < 17a + B can be reduced to: - 7bx < 35b, the solution is x < - 5

Using 1 / 2 [x + (x-20) = 84 equation to compile an applied problem
 
This is a question in this year's Qixiu period

There are pine and willow trees in one corner of the park. It is known that there are 20 fewer pine trees than willow trees. There are 84 trees in half of the two kinds of trees. Can you calculate the number of pine and willow trees in one corner of the park? (use equation solution)

Xiaoyun uses an electric energy meter to measure the electric power of a household appliance. When only the appliance in the circuit works, the measured energy consumption is 0.3 degree in 16 minutes
This appliance may be
A. Television B. incandescent lamp C. refrigerator D. air conditioner

6min=0.1h
P=W/t=0.3kwh/0.1h=3kwh
Select D

（x+8）∧3=27

（x+8）^3=27
x+8=3
x=-5
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What is the voltage and current of the car battery?

Car battery is 12V, the current is generally from 45A / h, 50A / h, 65A / h, different models of all battery current is a little different. But most of them are more common

7 and 1 / 9 * (7 / 8-0.125)

7 and 1 / 9 * (7 / 8-0.125)
=64 out of 9 * 7 out of 8-64 out of 9 * 1 out of 8
=56 / 9-8 / 9
=48 out of 9
=16 / 3

When the voltage at both ends of the motor is u, the current is I, and the resistance of the motor coil is r, the maximum mechanical power output of the motor is 0______ ．

According to the meaning of the question, the motor and the coil are connected in series in the circuit, so the voltage at both ends of the coil is u '= IR, because the currents in the series circuit are equal. According to the electric power formula P = u ″ I = (U-U ′) I = (U-IR) I = ui-i2r, the answer is: ui-i2r

Simple operation: 10.74 × 4.5-0.74 × 0.5 × 9 =?

10.74×4.5 - 0.74×0.5×9
= (10 + 0.74)×4.5 - 0.74×(0.5×9)
= 10×4.5 + 0.74×4.5 - 0.74×4.5
= 10×4.5
= 45