If there are two ways to charge mobile phone: the first way, the user's monthly phone fee: 10 yuan monthly rent plus 0.4 call fee per minute; The second way, the user's monthly fee: 25 yuan per month plus 0.2 yuan per minute 1. How long is the call time per month, and how much is the call cost of the two modes? Due to business needs, boss Zhang calls no less than 3 hours a month. Please help him figure out which one is cost-effective

If there are two ways to charge mobile phone: the first way, the user's monthly phone fee: 10 yuan monthly rent plus 0.4 call fee per minute; The second way, the user's monthly fee: 25 yuan per month plus 0.2 yuan per minute 1. How long is the call time per month, and how much is the call cost of the two modes? Due to business needs, boss Zhang calls no less than 3 hours a month. Please help him figure out which one is cost-effective

1.75 minutes, the cost of the two ways is the same
2. Monthly rent 25

According to the table of the following two mobile phone billing methods, consider the following problems. Mode 1: the monthly rent of mode 2 is 30 yuan / month & nbsp; & nbsp; & nbsp; & nbsp; 0; the local call fee is 0.30 yuan / minute and 0.40 yuan / minute. (1) how much is the charge for a local call of 200 points and 350 points per month? How about mode two? (2) For a local call time, will the two billing methods charge the same amount?

(1) When the time is 200 minutes, mode 1: 30 + 0.30 × 200 = 90 (yuan), mode 2: 0.40 × 200 = 80 (yuan). When the time is 350 minutes, mode 1: 30 + 0.30 × 350 = 135 (yuan), mode 2: 0.40 × 350 = 140 (yuan). (2) set X minutes, the two charging methods charge the same amount. 30 + 0.30x = 0.40x, x = 300

The following table shows the two mobile phone billing methods:
Global tour of China
The monthly rent is 15 yuan / month
Local call fee 0.08 yuan / min 0.20 yuan / min
Q: how many minutes do you call each month, and how much do you pay for the two calls?

Hello!
This is a junior high school mathematics one yuan equation, first of all, the yuan into angle 15 yuan = 150 yuan, 0.08 yuan = 0.8 yuan, 0.2 yuan = 2 jiao, convenient calculation, of course, do not change the words can!
A: let the talk time be x, and the equation: 150 + o.8x = 2x, the process of solution is
150=2X-0.8X
150=1.2X
X=125
So when the call time is 125 minutes, the two calls pay the same amount
Thank you, remember to give points Oh Pro!

A communication company has launched two mobile phone payment methods to answer the following questions
The first method does not pay the monthly rent, and pays 0.54 yuan per minute. The second method pays 18 yuan per minute, and pays 0.10 yuan per minute
① If the call lasts for X minutes a month, how much is the charge payable in mode a? How much is the charge payable in mode B?
② If the cost of the two methods is the same, what kind of equation can be listed? Is it a one variable equation?

Type A: 0.54x
Method B: 18 + 0.1X
0.54x=18+0.1x
It is a linear equation of one variable

There are two mobile phone billing methods in the table below
Monthly usage fee / yuan calling time limit / min calling overtime fee / (yuan / min) called
Method 1 58 150 0.25 free
Mode 2 88 350 0.19 free
Consider the following questions:
1. Set Tmin (t is a positive integer) as the calling number of a mobile phone in a month. According to the table above, the table shows how to charge according to mode 1 and mode 2 when t is in different time ranges
2. By observing your list, can you find out how to choose the charging method to save money according to the calling time? Verify your opinion through calculation

270 minutes is the critical value. No matter you use mode 1 or mode 2, the calling 270 minutes is 88 yuan. If you use mode 2, you should use mode 2
（t-150)*0.25=88-58

Wuhan mobile communication company has launched two kinds of mobile phone cards, and the charging standards are shown in the table below: type fixed monthly fee, each minute of call fee, a card 16 yuan 0.12 yuan, B card 0 yuan 0.3 yuan, mom's monthly talk time is generally about 60 points, Dad's monthly talk time is generally about 200 points, please help them choose a more cost-effective mobile phone card, and explain your reasons through calculation

If the call time is less than X minutes, it is cheaper to use card B; if the call time is more than X minutes, it is cheaper to use card A. from this, we can get: 16 + 0.12x = 0.3x & nbsp; & nbsp; 0.18x = 16, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; A: when the call time is less than 89 minutes, it is cheaper to use B card. When the call time is more than 89 minutes, it is cheaper to use a card. 60 minutes < 89 minutes, 200 minutes > 89 minutes. Therefore, the mother should choose B card, and the father should choose a card

The charging standards of the two types of mobile phone cards are as follows: class a monthly fee is 10 yuan, per minute call fee is 0.15, class B monthly fee is 0 yuan, per minute call fee is 0.2 yuan
How many minutes do you call each month? The two types of cards charge the same amount? How many minutes is it cheaper to choose a card

If you choose B within 200 minutes, for example, 199 minutes (a = 199 * 0.15 + 10 = 39.85; b = 199 * 0.2 = 39.8), so it's cost-effective to choose B when the call is less than 200 minutes, and B saves n * 0.05 yuan in one minute compared with a;
When it is equal to 200 minutes, it doesn't matter if you choose AB (a = 200 * 0.15 + 10 = 40; b = 200 * 0.2 = 40);
If it is more than 200 minutes, choose a directly. For example, if it is 201 minutes (a = 201 * 0.15 + 10 = 40.15; b = 201 * 0.2 = 140.2), a will save n * 0.05 yuan than B for every extra minute
(n = no less or every more time)

There are two kinds of mobile phone cards in a mobile company, and the standard charges are as follows: fixed monthly fee of card a: 30 yuan, call fee per minute: 0.6 yuan
B card 0 yuan 0.6 yuan
Uncle Wang's talk time is about 200 minutes a month. Please help him choose a more cost-effective mobile phone card and explain your reasons through calculation,

Yilan left in the book,
A card monthly: 30 + 0.6 × 200 = 150 yuan
B card monthly: 0.6 × 200 = 120 yuan
So should choose B card, because B card no monthly rent

Wuhan mobile communication company has launched two kinds of mobile phone cards, and the charging standards are shown in the table below: type fixed monthly fee, each minute of call fee, a card 16 yuan 0.12 yuan, B card 0 yuan 0.3 yuan, mom's monthly talk time is generally about 60 points, Dad's monthly talk time is generally about 200 points, please help them choose a more cost-effective mobile phone card, and explain your reasons through calculation

When the call time is less than X minutes, it is cheaper to use B card. When the call time is more than X minutes, it is cheaper to use a card. From this, we can get: 16 + 0.12x = 0.3x & nbsp; 0.18x = 16, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X ≈ 89

The monthly rental fee of globegroup is 40 yuan, and the local call fee of globegroup is 0.3 yuan per minute, and that of China is 0.5 yuan per minute. It's the same as a few minutes
Use the equation to solve

Now with such a high fee card, you can directly apply for a 186 card, which is universal across the country. If you have more 46.66.96 monthly phone calls, you can also send 80 megabytes of traffic. Specifically, you can go to the Unicom business hall to consult, or you can apply for an internal card, which costs several hundred yuan and costs as little as 10 cents to the whole country. It's very cost-effective for me to use two cards