Solution of a series of equations: 2.4 times of a number is 3.6 more than half of 4.2, find the number

Solution of a series of equations: 2.4 times of a number is 3.6 more than half of 4.2, find the number

Let this number be X
2.4X -4.2/2 =3.6
2.4X-2.1=3.6
2.4X =5.7
X= 5.7/2.4=57/24

How many meters is one foot and how many centimeters is one inch?

1foot feet = 12inches = 0.3048metre
1 inch = 25.4 mm = 2.54 cm

Li Hong read a story book. On the first day, she read 1 / 4 of the whole book. On the second day, she read 1 / 8 more than on the first day?

Three eighths

Given AB = 3, a + B, find the value of 3AB - [2A - (2ab-2b) + 3]

It is known that ab = 3, a + B = 4,
The value of 3AB - [2A - (2ab-2b) + 3]
=3ab-2a+2ab-2b-3
=5ab-2(a+b)-3
=5×3-2×4-3
=15-8-3
=4;
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The car and truck set out from two places at the same time and went in opposite directions. After 1.3 hours, they were still 168 kilometers apart. After 2.5 hours, they met on the way
How many meters is the distance between the two places?

The distance between the two places is x km
x=168÷（2.5-1.3）x2.5
x=350

It is known that A.B.C is the trilateral length of △ ABC, B.C. satisfies (b-2) &# 178; + | C-3 | = 0, and a is the solution of the equation | x-4 | = 2,
Judging the shape of △ ABC

∵（B-2）²+|C-3|=0,∴B=2,C=3
∵|X-4|=2,∴X^2-8X+16=4,X^2-8X+12=0,(X-2)(X-6)=0,X=2,X=6,∵2+3

From a to B, it takes 10 hours for car a to finish, and 15 hours for car B to finish. Now the two cars leave from ab at the same time. When they meet, car a is still far away from B
480 kilometers, thousands of meters apart?

When they met, a did the whole process: 15 (10 + 15) = 3 / 5
Distance between the two places: 480 (1-3 / 5) = 1200 km

1、 Say whether the rational number represented by the letter that meets the following conditions is a positive number? A negative number? Or zero? (1) a | = 0 (2) | a | > - A (3) | a | = - A
（4）a>-a

0
Positive number
negative
Positive number

Information about Shenzhou spacecraft

Shenzhou-1
Time: launched at 6:00 on November 20, 1999 and recovered on November 21, 1999
Launch site: Jiuquan Satellite Launch Center
Recycling location: Central Inner Mongolia
Shenzhou-2
Time: launched at 1:00 on January 10, 2001 and recovered on January 16, 2001
Venue: Jiuquan Satellite Launch Center
Recycling location: Central Inner Mongolia
Shenzhou 3
Time: March 25, 2002 22:00 launch, April 1 recovery
Venue: Jiuquan Satellite Launch Center
Recycling location: Central Inner Mongolia
Shenzhou IV
Time: launched at 0:00 on December 30, 2002, recovered on January 5, 2003
Venue: Jiuquan Satellite Launch Center
Recycling location: Central Inner Mongolia
Shenzhou-5
Time: launch at 9:00 on October 15, 2003, and recover 21 hours later
Venue: Jiuquan Satellite Launch Center
Recycling location: Siziwang Banner, central Inner Mongolia
Shenzhou-6
Time: launch at 9:00 on October 12, 2005, and recover after 115 hours and 33 minutes
Venue: Jiuquan Satellite Launch Center
Recycling location: Siziwang Banner, central Inner Mongolia
At 9:00 on October 15, 2003, China successfully launched its first manned spaceship, Shenzhou v. the 21 hour and 23 minute space trip marks that China has become the third country in the world to independently carry out manned space activities after the former Soviet Union / Russia and the United States
At this moment, it is only 3 years and 329 days from the launch of China's first test spaceship, and only 11 years and 25 days from the establishment of China's manned space project. Before the launch of the manned spaceship, the former Soviet Union conducted five tests of unmanned spaceship, and the United States conducted eight tests of unmanned spaceship. After four flight tests, China's Shenzhou spaceship successfully put people into space
The successful launch and landing of the Shenzhou-5 spacecraft marks a historic breakthrough in China's manned space project. "It took us 10 years to complete a great historical task, which is an important milestone in China's space history and a major contribution to the peaceful use of space," said Luan Enjie, former director of the national Space Administration

If the solution of equation 2x minus eight equals zero and ax minus two and x equals four is the same, then what is a equal to

2x-8=0
x=4
ax-2x=4
4a-8=4
4a=12
a=3