goi so hoc sinh chi co cho la:a
goi so hoc sinh chi co meo la:b
Theo bai ra, ta co:
\(\left\{\begin{matrix}a+19=52\\b+19=31\end{matrix}\right.\Leftrightarrow\left\{\begin{matrix}a=33\\b=12\end{matrix}\right.\)
\(\Rightarrow\)so hoc sinh co cho hoac meo hoac ca hai la: 33+12+19=64
so hoc sinh khong co ca cho lan meo la: 120-64=56(hs)
neu minh sai cho nao thi ban noi cho minh biet nha
A survey showed that of 120 secondary stuents :52 of them have a dog , 31 of them has a cat , and 19 have both. How many of 120 stuedents have neither a dog nor a cat
Alice is playing with words. At each tick of her grandfather’s clock she swaps two letters. What is the smallest number of clock ticks during which she can change WORDS to SWORD?(A) 3 (B) 4 (C) 6 (D) 7 (E) 8
This pinwheel star is formed by rotating a right-angled triangle
around one of its corners. What is the angle at each of the nine
tips that are marked with dots?
(A) 30◦
(B) 40◦
(C) 45◦
(D) 50◦
(E) 60◦
I have twelve paint tins each capable of holding twelve litres. Half of them are half
full. A third of them are a third full. The rest are one-sixth full. How many litres of
paint do I have in total?
(A) 48 (B) 50 (C) 52 (D) 54 (E) 56
If you walk 45 minutes at a rate 4km/h and then run for 30 minutes at a rate of 10km/h, how many kilometers will you have gone at the end of one hour and 15 minutes
A square and a triangle have equal perimeters. The lengths of three sides of the triangle are 6.2cm, 8.3cm and 9.5cm. The area of the square is...
the sum of the five possible is 3 times on of them , 7 times another and 5 times a third . The sum of the other two number is 34 . What is the largest of these five numbers ?
Chọn đáp án đúng
11. They meet their friends and.................... some fun
A. take B. have C. do D. enjoy
15. Some students say they are ............ have no time for pastme
A. hurry B. busy C. full D. hard
17. THey aren't any good movies ................ at the moment
A. goiing on B. being on C. performing D. showing
18. Sorry I can't come but thanks............
A. any ways B. any way C. anyway D. in anyway
Chia V
1.He(be).................. in HN for a year and then he(go)................ abroad
2. You(be)...................... to HCM City?- Yes, I (go)............. there last summer.
Cho dạng của V
2. Two million people die of...................... in 1945 HUNGRY
11. Walking in the rain gives us lots of....................... PLEASE
13. The room will look brighter if there is a ................. on the wall PAINT
A pattern of triangles is made from matches shown as follows:
If there are 2017 matches used, how many triangles have been formed?
Answer: triangles.
Giúp em với. Em chẳng hiểu đề.
Question 1: Find the highest common factor of 147x and 98y if HCF(x;y)=1.
Question 2: In a magic triangle, each of the six whole numbers 10; 11; 12; 13; 14; 15 is placed in one of the circles so that the sum, S, of the three numbers on each side of the triangle is the same. The largest possible value for S is______
Question 3: A pattern of triangle is made from matches shown as follows:
If there 2017 matches used, how many triangles has been formed?
P/s: Please help me! If possible, write the detail answer! Thanks for your help!!!
