7 x 3,8  : x+ 57 - 3 x 19 = 1,75

26,6     : x+ 57 -    57    = 1,75

  26,6   : x+   0               =1,75

  26,6   : x                      =1,75 - 0

  26,6      :x                       =1,75

             x                       =1,75 * 26,6

             x                       =46,55

Tick mình  nha***

a: Ta có: \(\left(x-7\right)\times22=\left(5\times x\right)+33\)

=>22x-154=5x+33

=>22x-5x=154+33

=>17x=187

=>x=11

b: TA có: \(7,75-\left(0,5\times x:5-6,2\right)=5\)

=>\(0,1\times x-6,2=7,75-5=2,75\)

=>\(0,1\times x=6,2+2,75=8,95\)

=>x=8,95:0,1=89,5

c: \(7:\left(3,8\times x-\frac{57}{19}+3\right)=1,75\)

=>\(7:\left(3,8\times x\right)=1,75\)

=>\(3,8\times x=7:1,75=4\)

=>\(x=\frac{4}{3,8}=\frac{20}{19}\)

\(7\left[\frac{\left(3,8x-57\right)}{19}+3\right]=1,75\Leftrightarrow x=\frac{\left[\left(\frac{1,75}{7}-3\right)\cdot19+57\right]}{3,8}=1,25\)

Vậy x = 1,25

\(3.8\cdot8.4=31.92\)

\(3.24\cdot7.2=23.328\)

\(0.125\cdot5.7=0.7125\)

3,8 x 8,4 = 31,92

3,24 x 7,2 = 23,328

0,125 x 5,7 = 0,7125

\(7:\left(\frac{3,8\times x-57}{19}+3\right)=1,75\)

=> \(\frac{3,8\times x-57}{19}+3=7:1,75\)

=> \(\frac{3,8\times x-57}{19}+3=4\)

=> \(\frac{3,8\times x-57}{19}=4-3=1\)

=> \(3,8\times x-57=19\)

=> \(3,8\times x=19+57=76\)

=> \(x=76:3,8=20\)

Vậy x = 20.

Bạn cho minh cách lam duoc k

Đề bài kiểu j vậy :<

bạn ghi rõ số ra đi

(-3,8) + [(-5,7) + ( +3,8)] = [(-3,8) + (+3,8)] + (-5,7)

= 0 + (-5,7) = -5,7