Question

I= \(10101.\left(\dfrac{5}{111111}+\dfrac{5}{222222}-\dfrac{4}{3.7.11.13.37}\right)\)

B=\(71\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{57}\right)\)

D= \(\left(19\dfrac{5}{8}:\dfrac{7}{12}-13\dfrac{1}{4}:\dfrac{7}{12}\right).\dfrac{4}{5}\)

F= \(\left(9.75.21\dfrac{3}{7}+\dfrac{39}{4}.18\dfrac{4}{7}\right).\dfrac{15}{78}\)

Giups mk vs!!!!!!!!

Answer 1

Trời ơi cái đề bài !!!

Thoy thì làm từng câu vậy

a) \(I=10101.\left(\dfrac{5}{111111}+\dfrac{5}{222222}-\dfrac{4}{111111}\right)\)

\(I=10101.\left(\dfrac{10}{222222}+\dfrac{5}{222222}-\dfrac{8}{222222}\right)\)

\(I=10101.\left(\dfrac{15}{222222}-\dfrac{8}{222222}\right)\)

\(I=10101.\dfrac{7}{222222}\)

\(I=\dfrac{7}{22}\)

Answer 2

1.

a) \(A=10101\left(\dfrac{5}{111111}+\dfrac{5}{222222}-\dfrac{4}{3.7.11.13.37}\right)\)\(A=\dfrac{10101.5}{10101.11}+\dfrac{10101.5}{10101.22}-\dfrac{10101.4}{10101.11}\)

\(A=\dfrac{5}{11}+\dfrac{5}{22}-\dfrac{4}{11}=\dfrac{7}{22}\)

Answer 3

\(B=\dfrac{2698}{45}-\left(\dfrac{344}{45}-\dfrac{17}{57}\right)\)

(Áp dụng tính chất a - (b - c) = a-b-c)

\(B=\dfrac{2698}{45}-\dfrac{344}{45}-\dfrac{17}{57}\)

\(B=\dfrac{2354}{45}-\dfrac{17}{57}\)

\(B=\dfrac{44726}{855}-\dfrac{255}{855}\)

\(B=\dfrac{44471}{855}\)

Answer 4

\(D=\left(\dfrac{95}{8}:\dfrac{7}{12}-\dfrac{13}{4}:\dfrac{7}{12}\right).\dfrac{4}{5}\)

(Áp dụng tính chất)

\(D=\left(\dfrac{95}{8}-\dfrac{13}{4}\right):\dfrac{7}{12}\)

\(D=\left(\dfrac{95}{8}-\dfrac{26}{8}\right):\dfrac{7}{12}\)

\(D=\dfrac{69}{8}:\dfrac{7}{12}\)

\(D=\dfrac{69}{8}.\dfrac{12}{7}\)

\(D=\dfrac{207}{14}\)

Answer 5

\(F=\left(9.75.9+\dfrac{39}{4}.\dfrac{72}{7}\right).\dfrac{5}{26}\)

\(F=\left(675.9+\dfrac{702}{7}\right).\dfrac{5}{26}\)

\(F=\left(6075+\dfrac{702}{7}\right).\dfrac{5}{26}\)

\(F=\left(\dfrac{42525}{7}+\dfrac{702}{7}\right).\dfrac{5}{26}\)

\(F=\dfrac{43227}{7}.\dfrac{5}{26}\)

\(F=1187.554945\) ( Không biết, máy tính ghi vậy =='' )

Answer 6

I = 10101 . (\(\dfrac{5}{111111}+\dfrac{5}{222222}-\dfrac{4}{3.7.11.13.37}\))

= 10101 . (\(\dfrac{10}{222222}+\dfrac{5}{222222}-\dfrac{8}{222222}\))

= 10101 . \(\dfrac{7}{222222}\)

= \(\dfrac{70707}{222222}\)

= \(\dfrac{7}{22}\)

@Sweet Cake

Answer 7

B = 71\(\dfrac{38}{45}-\left(43\dfrac{8}{45}-1\dfrac{17}{57}\right)\)

= 71\(\dfrac{38}{45}-43\dfrac{8}{45}+1\dfrac{17}{57}\)

= (71 - 43 + 1) + (\(\dfrac{38}{45}-\dfrac{8}{45}+\dfrac{17}{57}\))

= 29 + \(\dfrac{55}{57}\)

= 29\(\dfrac{55}{57}\)

@Sweet Cake