X + 0.3 = 1.8 how to solve the equation? Please explain in detail how you do it and teach me how to solve the equation? Please How to check?

X + 0.3 = 1.8 how to solve the equation? Please explain in detail how you do it and teach me how to solve the equation? Please How to check?

X + 0.3 = 1.8x = 1.8-0.3x = 1.5 both sides of the equation can add or subtract a number at the same time, or change all symbols at the same time, or multiply a number or divide by a number at the same time. In this problem, both sides of the equation can subtract 0.3 at the same time to get = 1.8-0.3

4 (X-12) = x + 12, x = 20, how to solve this equation?

Solution 4 (X-12) = x + 12
4x-48=x+12
4x-x=48+12
3x=60
x=20

How to solve the equation 2 * x + 4 * (88-x) = 244
...ji

How to solve the equation 2 * x + 4 * (88-x) = 244
352-2x=244
2x=352-244
2x=108
x=54

How to solve the equation of 0.88 x 120% X - x = 84?

0.88x120%X=1.056X
1.056X-X=0.056X
056x = 84, so x = 1500

As shown in the figure, in triangle ABC, EF are two points on AB and AC respectively, and AE: EB = AF: FC = 1:2. If the area of triangle AEF is 2, then the area of quadrilateral ebcf is 2

∵AE:EB=AF:FC=1:2
∴AE:AB=AF:AC=1:3
∴△AEF∽△ABC
The similarity ratio is 1:3
The area ratio is similar and the square is 1:9
The area of ∵ △ AEF is: 2
2 × 9 = 18
The area of quadrilateral is: 18-2 = 16

How many meters is 15 billion light years
One light year ≈ 9.46 × 10 12 km

The 26th power of 1.419 times 10

There are two charging standards for the call fee of a local communication company: ① the monthly rent is 30 yuan, and the call fee is 0.30 yuan per minute; ② without the monthly rent, the call fee is 0.60 yuan per minute______ When the time is less than 10 minutes, the cost under the two standards is the same; after this time, choose the second standard______ Two standards save money

Suppose that the two standard charges are the same when the talk time of Xiaojun reaches X minutes a month. From this, we can get the equation: 0.3x + 30 = 0.6x.0.3x = 30, x = 100

As shown in the figure, it is known that the quadrilateral ABCD is a square, the diagonal lines AC and BD intersect at O, Mn, parallel to AB, and intersect with OA and ob at M and N respectively
BM=CN
BM vertical cn

Extend CN to BM at e point;
Easy to prove △ ABM ≌ △ BCN, BM = CN and ∠ ABM = ∠ BCN, and because ∠ ABM + ∠ EBC = 90 degrees, so ∠ BCE + ∠ EBC = 90 degrees, so BM ⊥ CN
The original proposition is proved

Fill in the appropriate simplest fraction in brackets. 125m = () km 85 = () m 3750ml = () l 940cm = () m 2190g = () kg
1025dm square = () m square. It's a fraction, not a decimal. Geniuses, please help me. I'm going to pay it

125m=(1/8 )km
85dm=（17/20 ）m
3750ml=( 15/4 )l
940cm=(47/50 )m
2190g=(219/100 )kg
1025dm square = (41 / 4) m square

The starting price of a taxi in a city is 6 yuan per kilometer, and then 2.5 yuan per kilometer. Tingting pays 16 yuan from school to her grandmother's house. It's about 30 minutes from school to her grandmother's house
Urgent need

It's about X kilometers from the school to grandma's home
From the question: 6 + 2.5 (x-3) = 16
The solution is: x = 7 (km)
A: it's about 7 kilometers from the school to grandma's home