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A car drove from place a to place B at a speed of 90 km / h for 3 hours, just half of the whole journey. How many kilometers are there between the two places
54000 meters
The distance between a and B is 54 kilometers. A car drives from a to B at the speed of 60 kilometers per hour. It takes three fourths of an hour. How many kilometers are there from B?
I want the answer! Hurry!
9 km
The distance between a and B is 160 kilometers. A car travels 60 kilometers in 34 hours from a to B. at this speed, how many hours does it take to complete the whole journey?
I paid 45 yuan for six snacks and three drinks, and 30 yuan for three snacks and four drinks. How much is each snack and drink? How to answer without equation
Six snacks and eight drinks should be paid 60 yuan, so five drinks should be paid (60-45 = 15 yuan), each drink: 15 △ 5 = 3 yuan; each snack should be paid: (30-4 × 3) △ 3 = 6 yuan
100+99-98+97+96-95+…… 4+3-2+1
(100+1)*50=101*50=5050
2 to the minus 1, 2 to the minus 2, 6 to the minus 3, how to calculate the result
2^-1=?
2^-2=?
6 ^ - 3 =? I need not only the result, but also the operation process
The negative 1 power of 2 = 1 / 2
Negative 2 of 2 = 1 / 2 ^ 2
Negative 3 of 6 = 1 / 6 ^ 3
One and one times one half + two and two times one third + three and three times one fourth + four and one quarter + Ninety eight and ninety-eight times ninety-nine one
One and one times one half + two and two times one third + three and three times one fourth + four and one quarter + Ninety eight and ninety-eight times one ninety-nine = (1 + 2 + 3 + 1 +...) +98）+（1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/98-1/99）=（1+98）×98/2+（1-1/99）=4851+98/9...
How much is one ninth plus one ninety-nine plus one 999 plus one 9999!
There's no easy way! General denominator = (1 / 9) (1 + 1 / 11 + 1 / 111 + 1 / 1111) = (1 / 9) (101 / 1111 + 112 / 111 + 1 / 1111) = (1 / 9) (102 / 1111 + 112 / 111) = 135754 / (9 * 111 * 1111) = 135754 / 1109889, about = 0.1223131322142122313132214231313
9 and 1 / 3 + 99 and 1 / 3 + 999 and 1 / 3 + 9999 and 1 / 3 + 2 and 1 / 3=
The answer is 11110. Nine and one-third + ninety-nine and one-third + 999 and one-third + 9999 and one-third + two and two-thirds = 11110
I get it,
9 and 1 / 3 + 99 and 1 / 3 + 999 and 1 / 3 + 9999 and 1 / 3 + 2 and 2 / 3
=10 + 100 + 1000 + 10000 + two and two thirds - two and two thirds
=11110
9 and 1 / 3 + 99 and 1 / 3 + 999 and 1 / 3 + 9999 and 1 / 3 + 2 and 1 / 3
=2 / 10 - 3 + 2 / 100 - 3 + 2 / 1000 - 2 / 3 + 10000 - 2 / 3 + 2 / 3
=11110 - 8 / 3 + 8 / 3
=11110
4.5 × 9.99,
Original form
=4.5×（10-0.01）
=4.5×10-4.5×0.01
=45-0.045
=44.955
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