The number of A's is:
(99-3): 2 + 1 = 49 (term)
=> A = (99 + 3) * 49: 2 = 2499
Dress......
The number of A's is:
(99-3): 2 + 1 = 49 (term)
=> A = (99 + 3) * 49: 2 = 2499
Dress......
A=3+5+7+9+....+99
A=[(99-3):2+1]x[(99+3):2]
A=49x51
A=2499
The number of A's is:
(99-3): 2 + 1 = 49 (term)
=> A = (99 + 3) * 49: 2 = 2499
Dress......
The number of A's is:
(99-3): 2 + 1 = 49 (term)
=> A = (99 + 3) * 49: 2 = 2499
Dress......
A=3+5+7+9+....+99
A=[(99-3):2+1]x[(99+3):2]
A=49x51
A=2499
calculate:
1-3+5-7+9-11+13-.....+97-99+101
Calculate :
1-3+5-7+9-11+13-.............+97-99+101
Question 1:
The perimeter of the circle is cm
(Write your answer by decimal in the simplest form)
Question 2:
Calculate: 626.35+525.36 =
Question 3:
Calculate:
(Write your answer in the simplest form)
Question 4:
There are 60 seats on a train. 40% of the seats are empty. How many empty seats are there in the train?
Answer: There are empty seats.
Question 5:
A car traveled at a constant speed for 5 hours, covering a total distance of 301km. How far did the car travel for one hour?
(Write your answer by decimal in simplest form)
Answer:
Question 6:
The value of m is
Question 7:
Mrs. Jane buys 10kg of flour. She uses 1/6 of it to make a cake and 1/3 of it to make grape pies. How many kilograms of flour are left?
Answer: kg.
Question 8:
45% of M is 72. The value of M is
Question 9:
Emily rides her horse 21km in 7/6 hours. What is her average speed in kilometers per hour?
Answer: Her average speed is kilometers per hour.
Question 10:
Anna multiply together the following numbers
How many zeros are there at the end of the product?
Answer: There are zeros.
âu 9:
Calculate:
1/10+2/10+3/10+4/10+5/10+6/10+7/10+8/10+9/10+55/10
Question 1:
Calculate: 626.35+525.36 =
Question 2:
There are 60 seats on a train. 40% of the seats are empty. How many empty seats are there in the train?
Answer: There are empty seats.
Question 3:
Convert:
Question 4:
The perimeter of the circle is cm
(Write your answer by decimal in the simplest form)
Question 5:
The area of the trapezoid below is 100 m2. Find x
Answer: x =
Question 6:
Calculate: 23.76+18.52+16.24+41.48 =
Question 7:
14 hours 25 minutes – 7 hours 45 minutes = hours 40 minutes
Question 8:
The value of m is
Question 9:
Form the smallest 5 – digit odd number using all the digits below.
Answer:
Question 10:
Find N such that
Answer: N =
Mình đố các bạn : chứng minh rằng số có dạng abc - (a+b+c) chia hết cho 9
(kéo xuống để coi đáp án)
đáp án là : abc - (a+b+c) = 100a +10b + c -(a+b+c)=99a +9b mà 99 và 9 đều chia hết cho 9 nên 99a + 9b chia hết cho 9 hay abc - (a+b+c)
There are 9 different balls in a bag. Find the number of way(s) to pick 5 balls from the bag and arranged them in a row. (Different orders are considered different ways)
Exercise 7. Choose 2 numbers, without repetition, from 0, 3, 5, 6, 9 to form a 2-digit number. How many numbers with a digit “9” are there?
A. 6 B. 9 C. 7 D. 8
An had 60 marbles. An wanted to put them in bags so that there are equal numbers of marbles in each bag. How many ways can An equally put the 60 marbles in bags? (Including the case putting in one bag)
Answer: There are ..... ways.