=11/12*(-7/8+(-15/16)-1)

=11/12*(-45/16)

=-165/64

   study well

  k nha

 ai k đúng cho mk mk trả lại gấp dôi

Trả lời

-11/12.7/8+11/12.(-15/16)-11/12

=-11/12(7/8+15/16-1)

=-11/12.13/16

=-143/192

Chắc z, sai sai

\(\frac{-11}{12}.\frac{7}{8}+\frac{11}{12}.\left(\frac{-15}{16}\right)-\frac{11}{12}\)

\(=\frac{11}{12}\left(\frac{-7}{8}-\frac{15}{16}-1\right)\)

\(=\frac{11}{12}\left(\frac{-14}{16}-\frac{15}{16}-\frac{16}{16}\right)\)

\(=\frac{11}{12}.\frac{-45}{16}=\frac{-165}{48}\)

a) =-5/7 +7/8-2/7+1/8- -1/12+ -13/12

=(-5/7-2/7)+(7/8+1/8)-(-1/12--13/12)

=-7/7+8/8 - 12/12

= -1+1+1

=1

b)= ( -3/8+11/8)-(12/11+ -1/11)+(-3/5- 2/5)

= 1- 1 + (-1)

=-1

dễ lắm ó

ko có đề sao làm

E = 7/19 . 8/11 + 7/19 . 3/11 +12/19

= 7/19 . ( 8/11 + 3/11 ) + 12/19

= 7/19 . 11/11 + 12/19

= 7/19 . 1 + 12/19

= 7/19 + 12/19

= 7 + 12 / 19

= 19/19

= 1

\(A=\frac{7}{19}.\frac{8}{11}.\frac{7}{19}:\frac{3}{11}+\frac{12}{19}\)

\(A=\left(\frac{7}{19}\right)^2.\frac{8}{11}.\frac{11}{3}+\frac{12}{19}\)

\(\Rightarrow A=\left(\frac{7}{19}\right)^2.\frac{8}{3}+\frac{12}{19}\)

\(\Rightarrow A=\frac{392}{1083}+\frac{12}{19}\)

\(\Rightarrow A=\frac{1076}{1083}\)

ban sai roi nha

Ta có 27^5=3^3^5=3^15
243^3=3^5^3=3^15
Vậy A=B
2^300=2^(3.100)=2^3^100=8^100
3^200=3^(2.100)=3^2^100=9^100
Vậy A<B

\(A=\frac{56}{209}x\frac{7}{19}:\frac{3}{11}+\frac{12}{19}\)

\(A=\frac{392}{3971}:\frac{3}{11}+\frac{12}{19}\)

\(A=\frac{392}{1083}+\frac{12}{19}\)

\(A=\frac{1076}{1083}\)

\(\frac{x}{10}=\frac{y}{6}=\frac{z}{21}\)và \(5x+y-2z=28\)

6/7+9/8:9/1-3/16.2/1

6/7+9/8.1/9-3/16.2/1

6/7+1/8-3/8

48/56+7/56-21/56

17/28

3/11.[(7/12+-19/12)+(15/38+23/38)]

3/11.[-1+1]

3/11.0

0

\(\frac{6}{7}+\frac{9}{8}:9-\frac{3}{16}.2\)

\(=\frac{6}{7}+\frac{9}{8}.\frac{1}{9}-\frac{3}{8}\)

\(=\frac{6}{7}+\frac{1}{8}-\frac{3}{8}\)

\(=\frac{17}{28}\)