Calf 470 miner

1. forty-two × 10 + 50
= 420 + 50
= 470 (kg)
A: ten years later, this cow will weigh 470 kg

2. If the bull is XKG in one day and the calf is ykG
then 30x + 15y = 675
(30 + 12) x + (15 + 5) y = 940
that is, y = 45-2x
instead of 42x + 20Y = 940
21x + 450-20x = 470
x = 20
y = 5
now it is 42 + 20 = 62
so I bought 100-62 = 38

set a bull and a calf 38-a
then the cost is (42 + a) × twenty × 0.8+(20+38-a) × five × 0.8<= 1200
672+16a+232-4a<= 1200
12a<= 296
a<= 24 + 2 / 3
A: among the cattle purchased this time, there are at most 24 cows,
is it this?
it's not a question
hope to adopt ~ o (∩)_ ∩) O ~ good luck

3. Daniel and calf are not the same model. Calf means Huracan and Daniel means aventador. The calf's engine is smaller and cheaper. Daniu's engine has bigger displacement, more expensive price and stronger power. Lamborghini calf is equipped with a 5.2-liter V10 naturally aspirated engine. The latest calf engine has a maximum power of 470kw, a maximum torque of 600nm, a maximum power speed of 8000 rpm and a maximum torque speed of 6500 rpm. The engine is equipped with hybrid injection technology, and uses aluminum alloy cylinder head and cylinder block. This engine is matched with a 7-speed al clutch transmission. Lamborghini is equipped with a 6.5l V12 naturally aspirated engine. The maximum power of this engine is 544kw, the maximum torque is 690nm, the maximum power speed is 8500 rpm, and the maximum torque speed is 5500 rpm. This engine is equipped with multi-point EFI technology, and uses aluminum alloy cylinder head and cylinder block. Matching with this engine is the 7-speed ISR transmission. The price of Lamborghini bull is more than 6 million yuan, while that of Lamborghini calf is 2.728 million yuan to 3.848 million yuan. Maverick is the entry-level sports car of Lamborghini, while Daniu is the flagship sports car of Lamborghini. The power, price and positioning of these two cars are different. Daniu also has a higher performance version, which is more expensive.

4.

Charging always shows green light, indicating that the charger has no voltage output to the electric vehicle, small problem. There are two reasons for not charging: first, the charger is broken; second, the electric car's line is disconnected

the common faults of the electric vehicle charger are as follows:

1. The power supply does not start: plug in the power supply, the large capacitor has 300V voltage, unplug the power supply, and measure again whether the voltage at the two ends of the large capacitor does not drop. After discharging the capacitor, replace the starting resistor. The starting resistor is in the input part of power supply, with resistance value of 150k and power of 2W

2, the power supply does not start: plug in, there is 300V voltage at the two ends of the large capacitor, unplug the power supply, the voltage of the large capacitor slowly drops, check all the circuit boards for desoldering, after the repair welding is completed, replace the 3842 with a new one, and power on the test machine

3. Flashing light: repair the circuit board first, and then test the machine again. If the light is still flashing, please check the sampling resistance at the output end. 1 euro. 3W power. Connect it to the negative end of the output line and replace it with a new one

4. When the output voltage is high, when the power is on, the voltage is higher than 70 V, and the charging does not turn the lamp, first repair the circuit board and test the machine again. If the voltage is still high, please replace the optocoupler, test the machine again, or if the output voltage is high, replace the 431 reference voltage regulator and test the machine again

Squeaking, heating, insufficient charging: measure the voltage of the large capacitor when it is powered on. If it is lower than 300V, the general capacitor will be invalid and can be replaced

6, severe fever, please replace the fan

If the output voltage is unstable, repair the circuit board first, then test the machine, and then replace the output capacitance 63v470uf with a new one

When the charging lamp does not turn, test the data with the detector, and then replace the 358 or 324 with a new one

If the charging is unstable, sometimes it can be charged, sometimes it can't be charged, use the tester to test the data, then replace all the input and output power lines, repair and weld the circuit board, and test the machine

5. If the bull is XKG in one day and the calf is ykG
then 30x + 15y = 675
(30 + 12) x + (15 + 5) y = 940
that is, y = 45-2x
instead of 42x + 20Y = 940
21x + 450-20x = 470
x = 20
y = 5
now it is 42 + 20 = 62
so I bought 100-62 = 38

set a bull and a calf 38-a
then the cost is (42 + a) × twenty × 0.8+(20+38-a) × five × 0.8<= 1200
672+16a+232-4a<= 1200
12a<= 296
a<= 24 + 2 / 3
A: among the cattle purchased this time, there are 24 at most, which are from class 7.17 of No.8 Middle School

6. Live on April 22, calf vs spurs live
http://www.dbkw.net/a/yuele/470.html? 1271800892

watching the live video of Mavericks vs. spurs on April 22
http://www.dbkw.net/a/yuele/470.html? one billion two hundred and seventy-one million eight hundred thousand eight hundred and ninety-two