a, (\(\frac{9}{25}\) - 2.18) : (\(3\frac{4}{5}\) + 0,2)

 = (\(\frac{9}{25}\) - 36) : 4

 = \(\frac{-891}{25}\) :4

 = -8,91

                                        tạm thời làm tới đây

                                           Chúc bạn học tốt 

a) (925−2.18):(345+0,2)

 = (\(\frac{9}{25}\) - 36) : (\(\frac{19}{5}\) + 0,2)

= \(\frac{-891}{25}\) : 4

= \(\frac{-891}{100}\)

b) 518−1,456:725+4,5.45

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

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

= \(\frac{-443}{90}\) + \(\frac{18}{5}\)

= \(\frac{-119}{90}\).

a) \(\left(\frac{9}{25}-2.18\right):\left(3\frac{4}{5}+0,2\right)\)

\(=\left(\frac{9}{25}-36\right):\left(\frac{19}{5}+0,2\right)\)

\(=\left(-\frac{891}{25}\right):4\)

\(=-\frac{891}{100}\)

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

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

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

^...^  ^_^

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

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

\(\left(\frac{9}{25}-2.18\right):\left(3\frac{4}{5}+0,2\right)\)

\(=\left(\frac{9}{25}-36\right):\left(\frac{19}{5}+0,2\right)\)

\(=\left(-\frac{891}{25}\right):4\)

\(=-\frac{891}{100}.\)

Chúc bạn học tốt!

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