Tính hợp lí:

a.\((-17+|91|)-(91-|-17|-2011)\)\(1\)\()\)

b.\(\frac{4}{7}\)+\(\frac{5}{6}\):5-0,375.(-2)\(^2\)

c.\((\frac{-7}{11}\):\(\frac{5}{12}\)+\(\frac{-4}{12}:\frac{5}{12}).\frac{2.|-5|}{3}\)

d.\(1\frac{13}{15}.25\%.3+(\frac{8}{15}-\frac{79}{60}):1\frac{23}{24}\)

làm giúp mk với !

thanks mọi người

Tính giá trị các biểu thức sau 1 cách hợp lý:

a) A= 2018.20172017-2017.20182018

b) \(\frac{423134\times846267-423133}{423133\times846267+423134}\)

c) B= \(\frac{135\times1420+45\times780\times3}{3+6+9+12+...+24+27}\)

d) C= \(\frac{24347\times78-26\times4\times3\times6000}{4+5+6+7+...+24+25+28}\)

e) \(\frac{1978\times1979+1980\times21+1958}{1980\times1979-1978\times1979}\)

f) \(\left(12\times194+6\times437\times2+3\times369\times4\right)\div\left(1+5+9+13+...+57+61+65\times2-26\right)\)

Bài 12.Tính

a\(-\frac{4}{12}+\frac{6}{7}+\frac{8}{24}\)

b\(\frac{9}{18}+-\frac{7}{12}+\frac{13}{32}\)

c\(\frac{5}{-8}+\frac{14}{25}-\frac{6}{10}\)

d\(\frac{11}{26}+\frac{32}{39}--\frac{14}{52}\)

(câu a là âm\(\frac{4}{12}\); b là âm \(\frac{7}{12}\) ; d là âm\(\frac{14}{52}\))

tính

\(\dfrac{-5}{8}:\dfrac{15}{4}\) \(\dfrac{-15}{17}:\dfrac{25}{-34}\) \(-48:(\dfrac{-24}{5})\) \(\dfrac{-30}{7}:(\dfrac{-5}{-14})\)

\(\dfrac{15}{28}:(\dfrac{-9}{14})\) \(\dfrac{-7}{40}:(-\dfrac{21}{20})\) \((\dfrac{-4}{15}).(-\dfrac{-25}{8})\) \(\dfrac{5}{-14}.(-\dfrac{7}{10})\)

\(\dfrac{-15}{4}.(-\dfrac{16}{25})\) \(15.(-\dfrac{13}{10})\) \((-\dfrac{14}{5}).-10\) \((\dfrac{3}{-10}).(-\dfrac{-15}{2})\)

Tính:

A = ( \(2^{17}\) + \(17^2\) ) . ( \(9^{15}\) - \(3^{15}\) ) . ( \(2^4\) -\(4^2\) ) 

B= \(\frac{2^{13}+2^5}{2^{10}+2^2}\)

C = \(\left(1^2+2^2+2^3+........+2020\right)^2.\left(65.111-13.15.37\right)\)

 D = \(\frac{1+2+3+.....+2020}{6+8+10+........+54}\)

E = \(\frac{25^{28}+25^{24}+25^{20}+.....+25^4+1}{25^{30}+25^{28}+25^{26}+.....+25^2+1}\)

Tính:

a) (-15).\(\frac{3}{5}\)=(-15:5).3=-9

b) 42.\(\frac{-6}{7}\)=(42:7).(-6)=6.(-6)=-36

c) (-26).\(\frac{5}{13}\)=(-26:13).5=10

d) (-12).\(\frac{2}{5}\)=\(\frac{-12.2}{5}\)=\(\frac{-24}{5}\)

e) -17.\(\frac{-3}{52}\)=\(\frac{\left(-17\right).\left(-3\right)}{52}\)=\(\frac{51}{52}\)

Nhớ viết lời giải ra cho mình nhé!Cảm ơn cả nhà nhiều!