\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\\ x=\dfrac{1}{7}+\dfrac{3}{4}\\ x=\dfrac{25}{28}\\ b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\\ x+\dfrac{7}{5}=\dfrac{1}{6}\\ x=\dfrac{1}{6}-\dfrac{7}{5}\\ x=\dfrac{-37}{30}\\ c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\\ \dfrac{-1}{35}=\dfrac{x}{70}\\ \dfrac{-2}{70}=\dfrac{x}{70}\\ x=-2\\ d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\\ \dfrac{7}{8}.x=\dfrac{2}{9}-1\\ \dfrac{7}{8}.x=\dfrac{-7}{9}\\ x=\dfrac{-7}{9}:\dfrac{7}{8}\\ x=\dfrac{-8}{9}\)

\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\)

\(\Rightarrow x=\dfrac{1}{7}+\dfrac{3}{4}\)

\(\Rightarrow x=\dfrac{25}{28}\)

\(b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\)

\(\Rightarrow x+\dfrac{7}{5}=\dfrac{1}{6}\)

\(\Rightarrow x=\dfrac{1}{6}-\dfrac{7}{5}\)

\(\Rightarrow x=-\dfrac{37}{30}\)

\(c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\)

\(\Rightarrow\dfrac{-1}{35}=\dfrac{x}{70}\)

\(\Rightarrow35x=-70\)

\(\Rightarrow x=-2\)

\(d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\)

\(\Rightarrow\dfrac{7}{8}x=\dfrac{2}{9}-1\)

\(\Rightarrow\dfrac{7}{8}x=-\dfrac{7}{9}\)

\(\Rightarrow x=-\dfrac{8}{9}\)

\(A=\left(2+\dfrac{1}{5}-\dfrac{2}{3}\right)+\left(3-\dfrac{4}{5}+\dfrac{2}{3}\right)-\left(1+\dfrac{7}{5}-\dfrac{3}{5}\right)\)

\(A=2+\dfrac{1}{5}-\dfrac{2}{3}+3-\dfrac{4}{5}+\dfrac{2}{3}-1-\dfrac{7}{5}+\dfrac{3}{5}\)

\(A=\left(2+3-1\right)+\left(\dfrac{1}{5}-\dfrac{4}{5}-\dfrac{7}{5}+\dfrac{3}{5}\right)+\left(-\dfrac{2}{3}+\dfrac{2}{3}\right)\)

\(A=4+\dfrac{-7}{5}+0\)

\(A=\dfrac{20}{5}+\dfrac{-7}{5}=\dfrac{13}{5}\)

Tính giá trị của biểu thức

A=(2+1/5-2/3)+ (3-4/5+ 2/3)-(1+7/5-3/5)

= (2 + ( -7/5 ) + ( 3 - 22/5) - (1 + 4/5)

= 3/5 - 7/5 + 9/5

= 5/5

= 1

a: =-5/7(2/11+9/11)+12/7

=12/7-5/7

=7/7=1

b: \(=\dfrac{-12}{56}+\dfrac{35}{56}-\dfrac{28}{56}=\dfrac{-5}{56}\)

c: \(=\dfrac{1}{4}-\dfrac{5}{13}+\dfrac{2}{11}-\dfrac{8}{13}+\dfrac{3}{4}\)

=1-1+2/11

=2/11

d: \(=\dfrac{21}{31}+\dfrac{-16}{7}+\dfrac{44}{53}+\dfrac{10}{31}+\dfrac{9}{53}\)

=1+1-16/7

=-2/7

e: \(=\dfrac{\dfrac{4}{36}-\dfrac{30}{36}-\dfrac{144}{36}}{\dfrac{21}{36}-\dfrac{1}{36}-\dfrac{360}{36}}=\dfrac{-160}{-340}=\dfrac{8}{17}\)

tìm từ khắc với từ còn lại:

a) 1.fish 2.listen 3.time

b) 1.do 2. to 3. movies 4.go

c) 1.I 2. like 3.milk 4.die

d) 1. cold 2.close 3.hot 4.slow

e) 1.sea 2. tea 3 teather 4 weather

f) 1.chest 2.hand 3.head 4.toe 5.finger 6.big 7.noes

g) 1. table 2.chair 3 desk 4.couch 5.bench 6.hand

h)1.father 2.mother 3 sister 4.brother 5. people 6. uncle

i) 1. come 2. sit 3.desk 4.open 5. close 6. read 7.write 8. travel

a) 1.fish 2.listen 3.time

b) 1.do 2. to 3. movies 4.go

c) 1.I 2. like 3.milk 4.die

d) 1. cold 2.close 3.hot 4.slow

e) 1.sea 2. tea 3 teather 4 weather

f) 1.chest 2.hand 3.head 4.toe 5.finger 6.big 7.noes

g) 1. table 2.chair 3 desk 4.couch 5.bench 6.hand

h)1.father 2.mother 3 sister 4.brother 5. people 6. uncle

i) 1. come 2. sit 3.desk 4.open 5. close 6. read 7.write 8. travel

a) −512−512 . 419419 +−712−712 . 419419 -40574057 Đầu tiên, chúng ta tính toán phép nhân: −512 x 419419 = -214,748,928 −712 x 419419 = -298,238,328

Tiếp theo, chúng ta tính tổng của hai kết quả: -214,748,928 + -298,238,328 = -513,987,256

Cuối cùng, chúng ta trừ đi 40574057: -513,987,256 - 40574057 = -554,561,313

Vậy kết quả của phép tính a là -554,561,313.

b) 1313 . 4545 + 1313.1.1515 + ( −32−32 )^2 Đầu tiên, chúng ta tính toán phép nhân: 1313 x 4545 = 5,964,385 1313 x 1.1515 = 1,511.195 −32 x −32 = 1,024

Tiếp theo, chúng ta tính tổng của ba kết quả: 5,964,385 + 1,511.195 + 1,024 = 5,966,920.195

Vậy kết quả của phép tính b là 5,966,920.195.

.-. đề là j ă bn

Take it easy:

2 X 2 = 42 with 4 = 2 X 2 and 2 = 2 X 2 - 2

2 X 4 = 86 with 8 = 2 X 4 and 6 = 2 X 4 - 2

6 X 3 = 1812 with 18 = 6 X 3 and 12 = 6 X 3 - 6

...

So 7 X 2 = 147 with 14 = 7 X 2 and 7 = 7 X 2 - 7

7 X 2 = 14