Tính nhanh: a) A = 333333 x 333333
b) B = 333333 x 666666
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NT
1
LM
2
BT
2 tháng 6 2017
\(P=-\frac{7}{4}.\left(\frac{33}{12}+\frac{3333}{2020}+\frac{333333}{303030}+\frac{33333333}{42424242}\right)\)
\(P=-\frac{7}{4}.\left(\frac{33}{12}+\frac{33.101}{20.101}+\frac{33x10101}{30x10101}+\frac{33x1010101}{42x1010101}\right)\)
\(P=-\frac{7}{4}.\left(\frac{33}{12}+\frac{33}{20}+\frac{33}{30}+\frac{33}{42}\right)\)
\(P=-\frac{7}{4}.\left(\frac{11}{4}+\frac{33}{20}+\frac{11}{10}+\frac{11}{14}\right)\)
\(P=-\frac{77}{8}.\left(\frac{1}{6}+\frac{3}{10}+\frac{1}{15}+\frac{1}{21}\right)=-\frac{77}{8}.\frac{35+63+14+10}{210}=-\frac{11x122}{8x30}\)
\(P=-\frac{671}{120}\)
2 tháng 6 2017
P = -7/4 x (33/12 + 3333/2020 + 333333/303030 + 33333333/42424242)
= -7/4 x (33/12 + 33/20 + 33/30 + 33/42)
= -7/4 x [33 x (1/12 + 1/20 + 1/30 + 1/42)]
= -7/4 x [33 x (35/420 + 21/420 + 14/420 + 10/420)]
= -7/4 x (33 x 80/420)
= -7/4 x 33 x 4/21
= -7/4 x 4/21 x 33 (= -7x4 / 4x21 x33)
= -7/21 x 33 (= -7x33 / 21 = -1x7x3x11 / 3x7)
= -11/1
= -11
Đáp số P = -11
Các số gạch đi là do rút gọn phân số nhé!!!
16 tháng 7 2016
\(=15.\left(\frac{21.10101}{43.10101}-\frac{33.10101}{35.10101}\right)\)
\(=15.\left(\frac{21}{43}-\frac{33}{35}\right)\)
\(=15.\frac{-684}{1505}=\frac{-2052}{301}\)
TT
1
13 tháng 6 2018
Sửa đề:
\(\frac{1}{33}\times\left(\frac{33}{12}+\frac{3333}{2020}+\frac{333333}{303030}+\frac{33333333}{42424242}\right)\)
\(=\frac{1}{33}\times\frac{33}{12}+\frac{1}{33}\times\frac{3333}{2020}+\frac{1}{33}\times\frac{333333}{303030}+\frac{1}{33}\times\frac{33333333}{42424242}\)
\(=\frac{1}{12}+\frac{33\times101}{33\times101\times20}+\frac{33\times10101}{33\times10101\times30}+\frac{33\times1010101}{33\times1010101\times42}\)
\(=\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}\)
\(=\frac{1}{3x4}+\frac{1}{4x5}+\frac{1}{5x6}+\frac{1}{6x7}\)
\(=\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}\)
\(=\frac{1}{3}-\frac{1}{7}\)
\(=\frac{4}{21}\)
8 tháng 5 2021
A)my name is Nguyen Le Xuan Nhi.
b) i'm 10 years old.
c) i'm live in Ha Noi.
d) I'm in class 4E.
2.
1. A 2.B 3.A 4.A 5.B
3.
a) Mai decorates her house and gives many flowers.
b) Mai gets lucky money and visits relatives.
C) Nam cleans his house , makes banh chung, goes shopping, visits relatives and eats banh chung.
d) yes, he does.
E
8 tháng 5 2021
ĐỀ TIẾNG ANH LỚP 4 HỌC KÌ II ( Đề 1)
1. Write about you
a/ What's your name? - ...My name is Ha.............................................
b/ How old are you? - ....I'm fifteen years old................................................
c/ Where do you live? - ...I live in Vinh Phuc Province..............................................
d/ What class are you in? - ..I'm in class 9A.........................................
2. Choose the best answer
1. What's your ........ number?
A. phone B. are C. this
2. What ............ do you want to see?
A. food B. animal C. to
3. Where are you going to do this summer?
A. I'm going to Ha Long Bay B. I'm go to for a picnic
C. I food
4. How much are the trousers?
A. They’re one hundred fifty thousand dong.
B. It’s ninety – nine thousand dong.
C. Both answers above
5. What do you ….... Tet?
A. for B. at C. no
3. Read and answer the questions
+ My name is Mai. I decorate my house and give many flowers before Tet. I get lucky money and visit relatives during Tet. I love Tet.
+ My name’s Nam. I clean my house, make banh Chung and go shopping before Tet. During Tet, I visit relatives and eat banh Chung. I love Tet, too.
a/ What does Mai do before Tet?
-…She decorates her house and give many flowers before Tet………………………………………………………..
b/ What does Mai do during Tet holiday?
-…She gets lucky money and visit relatives during Tet…………………………………………………………..
c/ What does Nam do in before and during Tet?
-…He cleans his house, make banh Chung and go shopping before Tet. During Tet, he visits relatives and eat banh Chung. ………
d/ Does Nam Tet?
-…Yes, he does…………………………………………………………..