-4/12 + 18/45 - 6/9 - 21/35 + 6/30

= -1/3 + 2/5 - 2/3 - 3/5 + 1/5

= (2/5 - 3/5 + 1/5) - (1/3 + 2/3)

= 0 - 1

= -1

\(=-\frac{1}{3}+\frac{2}{5}-\frac{2}{3}-\frac{3}{5}+\frac{1}{5}\)

\(=\left(-\frac{1}{3}-\frac{2}{3}\right)+\left(\frac{2}{5}-\frac{3}{5}+\frac{1}{5}\right)\)

\(=-1+0\)

\(=-1\)

=.= hk tốt!!

a. 7/21 + 9/-36 = 1/3 + (-1/4) = 4/12 + (-3/12) = 1/12

b. -12/18 + (-21/35) = -2/3 + (-3/5) = -10/15 + (-9/15) = -19/15

c. -3/21 + 6/42 = -1/7 + 1/7 = 0

d. -18/24 + 15/-21 = -3/4 + (-5/7) = -21/28 + (-20/28) = -41/28

a)  ;

b) 

  .

c) .

d) 

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

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

\(A=-1+1+\frac{-1}{5}\)

\(A=\frac{-1}{5}\)

\(B=\frac{-4}{12}+\frac{18}{45}+\frac{-6}{9}+\frac{-21}{35}+\frac{6}{30}\)

\(B=\frac{-1}{3}+\frac{2}{5}+\frac{-2}{3}+\frac{-3}{5}+\frac{1}{5}\)

\(B=\left(\frac{-1}{3}+\frac{-2}{3}\right)+\left(\frac{2}{5}+\frac{-3}{5}+\frac{1}{5}\right)\)

\(B=-1+0\)

\(B=-1\)

\(B=-\frac{1}{3}+\frac{2}{5}-\frac{2}{3}-\frac{3}{5}+\frac{1}{5}\)

\(=\left(-\frac{1}{3}-\frac{2}{3}\right)+\left(\frac{2}{5}-\frac{3}{5}+\frac{1}{5}\right)\)

\(=-\frac{3}{3}+0\)

\(=-1\)

=.= hk tốt!!

B=\(\frac{-4}{12}+\frac{18}{45}+\frac{-6}{9}+\frac{-21}{35}+\frac{6}{30}\)

  =\(\frac{-4}{4\cdot3}+\frac{2\cdot9}{5\cdot9}+\frac{\left(-2\right)\cdot3}{3\cdot3}+\frac{\left(-4\right)\cdot7}{5\cdot7}+\frac{6}{5\cdot6}\)

  =\(\frac{-1}{3}+\frac{2}{5}+\frac{-2}{3}+\frac{-4}{5}+\frac{1}{5}\)

  = \(\left(\frac{-1}{3}+\frac{-2}{3}\right)+\left(\frac{-4}{5}+\frac{2}{5}+\frac{1}{5}\right)\)

  =\(\frac{-3}{3}+\frac{-1}{5}\)

  = \(-1+\frac{-1}{5}\)=\(\frac{-5-1}{5}=\frac{-6}{5}\)

ủng hộ mk nha mọi người

\(\frac{-5}{10}+\frac{12}{28}-\frac{3}{27}-\frac{7}{18}+\frac{20}{35}\) 

\(=-\frac{1}{2}+\frac{3}{7}-\frac{1}{9}-\frac{7}{18}+\frac{4}{7}\)

\(=\left(-\frac{1}{2}-\frac{1}{9}-\frac{7}{18}\right)+\left(\frac{3}{7}+\frac{4}{7}\right)\)

\(=\left(-\frac{9}{18}-\frac{2}{18}-\frac{7}{18}\right)+1\)

\(=-1+1=0\)

kết quả =0

\(\frac{13}{21}\)+   \(\frac{8}{21}\) :   \(\frac{16}{21}\)

=  \(\frac{13}{21}\)+  \(\left(\frac{8}{21}:\frac{16}{21}\right)\)=   \(\frac{13}{21}\)+   \(\frac{1}{2}\)

=   \(\frac{47}{42}\)

\(\frac{36}{35}\):   \(\frac{8}{3}\)-  \(\frac{36}{35}\):   \(\frac{6}{11}\)

=   \(\frac{27}{70}\)-   \(\frac{66}{35}\)=   \(-\frac{3}{2}\)

Bản quyền chính cấm sao chép và copy dưới mọi hình thức

\(\frac{-12}{18}\)<  \(\frac{-21}{35}\)

\(\frac{34}{153}\)<  \(\frac{32}{104}\)

\(\frac{141}{893}\)<  \(\frac{159}{901}\)

k cho mình

a)

13/36 + 17/45 + -23/20

= 133/180 + -23/20

= -37/90

b)

18/35 + -11/21 + -23/20

= -1/105 + -23/20

= -487/420