Mathematics Grade 5 to solve equations How to solve mathematics equations in Grade 5

Solution: Set the speed of the armored vehicle to be a kilometer per hour. Then B's speed is a-12 km/h.

Car A travels more kilometers than car B.

Time taken = 63 12 = hours.

So. a-12）×

a = 42 kmh.

Or. a (a = 42 kmh.)

2. If the first car travels x kilometers per hour, the following equation can be listed:

Since the meeting was 30km away from the West Station, the travel time for both cars should be 60 12 = 5 hours.

And hour A arrives at the West Railway Station, and after returning and meets car B, it means that A has walked for another hour, so there is:

So x = 60 km hours.

If vehicle A travels x kilometers per hour, then vehicle B travels x to 12 kilometers per hour, and the total distance = kilometers.

The total distance traveled when the two met was 2*km.

Total time at the time of encounter = 30 x + hours.

So 9x=(x+x-12)(30 x+

x = 60 A car travels 60 kilometers per hour.

A travels x kilometers per hour, then:

Solution: x=60 (kilometers per hour).

Example 3 of Grade 5 Mathematics Book I "Solving Equations".

Unary Linear Equation Solution Steps:

Denominator: Multiply by the least common multiple of each denominator on both sides of the equation (the term without the denominator is also multiplied).[Basis: Nature of Equation 2].

Remove parentheses: generally go to the small brackets first, then go to the middle brackets, and finally go to the curly braces, which can be assigned according to the multiplication law (remember that if there is a minus sign or a division sign outside the parentheses, you must change the sign) [basis: multiplicative distribution law].

Shift terms: Move all terms containing unknowns in the equation to the side of the equation (generally move the terms containing unknowns to the left of the equation and move the constant terms to the right) [Basis: Properties of Equation 1].

Merge similar terms: Equation in the form ax=b(a≠0);[Basis: Multiplicative distributive law (inverse multiplicative distributive law)].

The coefficient is reduced to 1: the coefficient a of the unknown number is divided by both sides of the equation to obtain the solution of the equation x=b a[Basis: Nature of Equation 1].

Move the unknown to one side and the number to the other. Then find out the number with the unknown, and only the unknown is the result.

Hello, if you want to solve a mathematical equation, first put the unknown to the left of the equal sign, and then put the number to the right of the equal sign, if there is a fraction, then the left and right sides of the equal sign are multiplied by the least common multiple of the denominator, so that you can find the unknown.

If the least common multiple of the denominator 9 and 12 is 36, then the question can be written as, x minus 28/36 equals 15/36, and the solution is x 43 36.

The process of solving the equation is as follows.

x-7/9 = 5/12

x = 5/12 + 7/9

x = 15/36 + 28/36

x = 43/36

x-7/9 = 5/12

Solution: x 5/12 + 7/9

x = 43/36

If x kilograms are taken from box A to box B, the following formula is listed according to the conditions:

46 a x = ten x), 46 a x = 24 ten, ten x = 46 a 24, x = 22.

A: Take 10 kg from box A.

Put it in box B!

Solution: Let's assume that the weight of the apples taken out of box A is x kilograms.

Then: 46-x=(20+x).

x = 10 to get the final result is to take out 10 kg of apples from box A.

Solution: Suppose to take out x kilograms, 46-x) (20+x).

46-x＝24+

x 10 A: Take out 10 kg.

Design: The younger brother collects x stamps.

4x+x=225

5x=225x=45

My sister has 4x pieces.

4x+x=225x=45

The siblings have 180 and 45 stamps respectively.

Set brother x, sister 4xBrother and sister 5x=225

x=45, brother 45

Sister 180

==Don't you say that there are 225 in total?。

The younger brother is 45 and the older sister is 180

Let's say Xiaoli is x years old this year, so grandma is 10x years old this year.

10x - x = 45

9x = 45

x = 45÷9

x = 5 Xiaoli = x = 5

Granny = 10x = 50

A: Xiaoli is 5 years old and grandma is 50 years old.

She Xiaoli is x years old this year.

10x=x+45 (grandma's age is equivalent) x=5

Xiaoli is 5 years old and her grandmother is 50 years old.

Dismiss Xiaoli x years old.

10x=x+45

10x-x=45

9x=45x=5

Grandma's age is: 5+45=50

A: Xiaoli is 5 years old, and her grandmother is 50 years old.

The third: 2x=29-27 2x=2 x=1 The fourth x=one-third - one-eighth equals 5/24 and then gives you the first two.

Someone will help you this time, but next time you will have to use your own brain!

Solution: The original formula can be reduced to ,,x=.