a) \(=-\frac{91}{50}:4\)

   \(=-\frac{91}{200}\)

b) \(=\frac{5}{18}-\frac{26}{5}+\frac{18}{5}\)

   \(=-\frac{119}{90}\)

\(\left(\frac{9}{25}-2,18\right):\left(3\frac{4}{5}+0,2\right)\)

\(=\left(-1,82\right):4\)

\(=-0,455\)

90. a) \(-\frac{91}{200}\)

b) \(-\frac{119}{90}\)

118. a) >

b) >

c) >

d) =

Bài 90:

Bài 118 SBT:

Chúc bạn học tốt!

a) (925−2.18):(345+0,2)(925−2.18):(345+0,2)

=(925−36):(195+15)=(925−36):(195+15)

=(925−90025):205=(925−90025):205

=−89125:4=−89125:4

=−891100=−8,91

\(\left(\frac{9}{15}-2,18\right):\left(3\frac{4}{5}+0,2\right)=\left(0,6-2,18\right):\left(3,8+0,2\right)=-1,58:4=-0,395\)

= -8,91             

lớp 7???

lớp 6!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

\(\frac{5}{18}-1,456:\frac{7}{25}+4,5.\frac{4}{5}=-\frac{119}{90}\)

a)

b)

a)

\(\left(\dfrac{9}{25}-2.18\right):\left(3\dfrac{4}{5}+0.2\right)\)

\(=\left(-1.82\right):4=-0.455\)

b) \(\dfrac{5}{18}-1.456:\dfrac{7}{25}+4.5\cdot\dfrac{4}{5}\)

\(=\dfrac{5}{18}-5.2+3.6=-1\dfrac{29}{90}\)

a)\(P=\left(-0,5-\frac{3}{5}\right):\left(-3\right)+\frac{1}{3}-\left(-\frac{1}{6}\right):\left(-2\right)\)

\(=\left(\frac{-1}{2}-\frac{3}{5}\right):\left(-3\right)+\frac{1}{6}:\left(-2\right)\)

\(=\frac{-11}{30}:\left(-3\right)+\frac{1}{3}+\frac{1}{6}:\left(-2\right)\)

\(=\frac{11}{30}+\frac{1}{3}+\frac{-1}{12}\)

\(=\frac{37}{60}\)

b)\(Q=\left(\frac{2}{25}-1,008\right):\frac{4}{7}:\left[\left(3\frac{1}{4}-6\frac{5}{9}\right).2\frac{2}{17}\right]\)

\(=\left(\frac{2}{25}-\frac{126}{125}\right):\frac{4}{7}:\left[\left(\frac{13}{4}-\frac{59}{9}\right).\frac{36}{17}\right]\)

\(=\frac{-116}{125}:\frac{4}{7}:\left[\frac{-119}{36}.\frac{36}{17}\right]\)

\(=\frac{-116}{125}:\frac{4}{7}:-7\)

\(=\frac{29}{125}\)