When x is equal to, 2 × minus 3 in 5 is opposite to 2 × minus 3 in 3

When x is equal to, 2 × minus 3 in 5 is opposite to 2 × minus 3 in 3

2x/5-3+3-2x/3=0
2x/5-2x/3=0
Multiply both sides of the equation by 15 to get:
6x-10x=0
4x=0
x=0

When encountering such problems as "counting 8km-5km60m with decimals", do you want to add km after 8.0 when writing recursive equation?

You mean that the unit has participated in the calculation, and the unit always has. This is a complex number problem, and there is no way to calculate without the unit. In the calculation, there are generally two cases of the unit: (1) the unit participates in the calculation, for example, 10km-8km = 2km. In this case, the unit does not add brackets; (2) 10-8 = 2 (km) the unit does not participate in the calculation, and the unit should add brackets

A, B and C weigh 450 kg in total. The mass ratio of a to B is 5:4, and the mass ratio of B to C is 2:3. How many kg does a weigh?

B's mass: 450 △ 54 = 120 (kg), a's mass: 120 × 54 = 150 (kg), a's weight: 150 kg

There are two routes between a and B. someone rides a bicycle from a to B along route one at the speed of 9km / h, and then returns to a along route two from B at the speed of 8km / h. It is known that route two is 2km less than route one and takes 0.125 hours less time. The length of route one can be calculated

== that equation is right, the result seems to have a problem, is 9

The total area of the earth's ocean is about 3.6 * 10 ^ 8km2. What percentage of the earth's surface area is the ocean
The volume of water on the earth can be calculated by calculating the average depth of sea water 3.7 * 10 ^ 3M (expressed by scientific and technological method)

The first problem can only be obtained from the previous person's empirical data, because it can't be calculated from the Chinese formula of the title
The total area of the earth is 510 million square kilometers
The earth's land area is 149 million square kilometers, accounting for 29.2% of the earth's surface area
The earth's ocean covers an area of 361000000 square kilometers, accounting for 71.8% of the earth's surface area
So the answer is as follows:
Previous question: the total area of the ocean is 71 percent of the surface area of the earth
The answer is 3.6 * 10 ^ 8 * 3.7 * 10 ^ 3 = 1.332 * 10 ^ 12m ^ 3

2t9kg + 450kg = how much T "calculate with decimal" fast

2.459t

3 yuan 2 can 4 yuan 3 can 8 yuan 5 can which kind of beverage is the cheapest?

Four yuan three can drop

Which drink is the cheapest? 3 yuan 2 cans 4 yuan 3 cans 8 yuan
Which drink is the cheapest? 3 yuan 2 cans 4 yuan 3 cans 8 yuan 5 cans

The first is that 3 divided by 2 equals 1.5, the second is that 4 divided by 3 equals about 1.3, and the third is that 8 divided by 5 equals about 1.6

Here are three different kinds of packages for a certain beverage, which are cheap (1) 150ml 3 yuan (2) 1L 15 yuan (3) 1500ml 18 yuan

The third kind

There are 12 bags of a kind of beverage in each box. The wholesale price is 36 yuan per box, and the retail price is 4 yuan per bag?
Comprehensive formula

Of course, it's one yuan. 4-36 / 12 = 1