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Spring Festival is coming!
spring festival is coming!
He can do housework
He can do housework
A. B is 840 kilometers away from each other. Car a and B leave from a and B at the same time. Car a travels 90 kilometers per hour and car B 120 kilometers per hour?
840 △ 90 + 120. = 840 △ 210, = 4 hours. A: after 4 hours, the two cars meet
In the equation 2x-3y = 19, if the sum of X and Y is 7, then the value of X is
2x-3y=19
2（x+y)-5y=19
14-5y=19
Then y = - 1
2x=19+3y=16
x=8
A and B leave from a and B at the same time and meet at 36km from the midpoint after 3 hours. It is known that the speed ratio of a and B is 3:2. How many kilometers are there between a and B?
A: the distance between a and B is 360 km
If 1 / 7 is changed into a decimal, the number after the decimal point is zero__________ .
If 1 / 7 is changed into a decimal, the number 2013 after the decimal point is 2, because 1 / 7 = 0.14285714285714. It is an infinite circular decimal, and the circular section has 6 digits. Dividing 2013 by 6 is equal to more than 3 of 335, and the remaining 3 means that the number 2013 is the third digit of the circular section, so it is 2
A, B two cars respectively from the two places, their speed ratio is 5:7, in the distance of 18km meet, how many dry meters between the two places? Tomorrow to hand in!
18x2 / (7-5) x (5 + 7) = 216 km
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It is known that the equation 2Sin (x + π 4) = k has two solutions on [0, π], then the value range of real number k is______ ．
∵ 0 ≤ x ≤ π, ∵ π 4 ≤ x + π 4 ≤ 5 π 4, ∵ 22 ≤ sin (x + π 4) ≤ 1, ∵ 1 ≤ 2Sin (x + π 4) ≤ 2. Also ∵ f (x) = 2Sin (x + π 4) = k has two solutions on [0, π],
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